Peak years for gaming consoles?

This is gonna sound odd for the PS3, but I'm not kidding when I give this answer: 2013.
Why? Two games: GTA V, and The Last of Us. GTA V initially only came out on 7th-gen consoles, namely the PS3 and Xbox 360. If you look up best-selling PS3 games, GTA V is at the top. Then The Last of Us came out and was praised for, well, everything: the story, the graphics, the emotionality.
Not only that, but it was also the year the PS3 accomplished something that, when it first came out, nobody thought was ever gonna happen: it outsold the Xbox 360. That's right, not only had the PS3 accomplished its goal of becoming an actual successful console people wanted to buy, but it also accomplished its goal of defeating its competition.
Combine this with Microsoft and Nintendo's simultaneous floundering during this time, in combination with the glowing praise given to the PS4's launch, this was a really good year to be Sony.

Yeah, you're pretty much spot on. I mean, they literally use a Nintendo controller to control the Statue of Liberty in Ghostbusters II. There was also The Wizard and cartoons like The Super Mario Bros Super Show, Captain N, and The Legend of Zelda.
In my opinion either 1989 or 1990 (the year Super Mario Bros 3, often considered the best NES game, came out) would be good answers.

2017-2019 could work but I chose 2018 because of those games you mentioned. Not a big fan of them myself but they are among the most popular PS4 exclusives. Spiderman is probably the most popular PS exclusive from that generation. 

You make a good point with kinect but 2010 was the first full year of the PS3 rebrand era when it was regaining steam so i'm not so sure. PS3 was basically on life support in the late 2000s on the other hand so everyone gamed on the 360 instead.

Those were definitely classic games in 1989. It took me until 2003 to truly beat ninja turtles without cheats, when I got in the early 90s is was the biggest disappointment ever and it was borderline impossible for so many kids, I didn't have the game genie yet, it was still popular. Ducktales was awesome, I think I got when it first came out. Ninja Gaiden was hard as hell, I only rented it. Couldn't get past stage 3. I bought it and beat it in the 2000s.  

Mega 2 and 3 were perfect, Ninja Turles 2, Castlevania 1 and 3 were perfect, Crystalis was the best RPG on the nes imo, Punch out and ghosts n goblins took years, to finish but were doable, Mario 3 was the best mario. 

It was def a cool concept that there were sega games on the nes which the sega never did. But tbh lots of tengen games were mostly difficult or not as good as the other versions, I guess there some exceptions i. I had afterburner and alien syndrome which were sega ports, I returned afterburner to toys r us and traded the other with a friend.

I wish genesis made nes ports in 16 bit, it would have been cool as hell to see Super Mario Bros 3 in 16 bit. 

I agree with most of these. I would say for Atari 2600 however that 1982 was really the peak. It was absolutely everywhere that year, games like Pitfall came out, as did the Pac-Man port, both of which are among the best-selling games for the system. Of course, you did have ET come out, but that was at the very end of the year. By 1983, as we know, the video game industry crashed, and Atari was in trouble. By 1984, they went bankrupt. The Atari brand and even the 2600 didn't go away however, in fact, the 2600 still continued to be sold in stores throughout the 80s, and was widely played amongst by those who didn't have an NES yet. James Rolfe of the AVGN didn't get an NES until 1988 for example. SNES, I agree with John Titor and would go for 1995, since that's when Nintendo definitively won the console war, whereas in 1994, they were still battling with Sega. You could argue 1994 was a better year for games (one of the best years for video games in my opinion), but 1995 in my opinion is just as strong with the likes of Donkey Kong Country 2 (considered by many the best of the trilogy), Earthbound, Yoshi's Island, and Chrono Trigger. 1993 for Genesis makes sense. That was the year Mortal Kombat was released on both systems. The SNES port sucked and was censored. This certainly helped Sega. Not to mention Sonic at the height of their popularity (alongside late 1992 and 1994). As for DOS gaming, I mean, it took a while for Windows gaming to truly catch on. In 1996, Duke Nukem 3D and Quake were the biggest PC games of that year, and both were made for the DOS platform. By 1997, you did start to see a shift, but even then, DOS games were still big and some were still being released (the first GTA comes to mind). 1998, DOS gaming I would say was pretty much dead. But as for when it peaked, I would say DOS gaming gradually overtook the Amiga as the dominant platform for PC gaming during the early 90s. By the time Wolfenstein 3D was released (1992), it was official. I'd definitely say the peak would've been 1994, since Doom did come out in '93, but late in the year, and so it was big in 1994.
The PS1, and really the 5th gen in general peaked in 1998, without a doubt. That was the year so many good games came out (hence why it's considered the greatest year in gaming by journalists), like Metal Gear Solid, Gran Turismo, Tekken 3, Resident Evil 2, Crash Bandicoot 3: Warped, Spyro the Dragon. 1997 was of course also important with the release of Final Fantasy VII (and titles like PaRappa the Rapper certainly help), as was 1999 (with Crash Team Racing, Ape Escape, Dino Crisis, Syphon Filter, and Silent Hill), but NOTHING comes close to 1998 in terms of the sheer amount of quality titles released. The system was still popular in 2000, with lots of quality titles being released, but you could the system was winding down. Many of these titles were sequels to preexisting PlayStation games, like Spyro 3: Year of the Dragon, Final Fantasy IX, Dino Crisis 2, and Syphon Filter 2. These are all great titles, in fact, some of them, like Year of the Dragon and Dino Crisis 2, are my favorite titles in their franchises, but you can tell the PS1 was getting burnt out. You did have Chrono Cross and Vagrant Story being released, so these titles, in addition to FFIX made 2000 a strong year for RPG fans, but this was really the last year the PS1 was truly big and releasing new high-quality titles. By 2001, most third-party companies focused their efforts on the next generation of consoles (especially the PS2), as well as Sony themselves shifting all their focus on the PS2, which was exploding in popularity. The PS1 was still being played a lot, but as far as NEW titles were concerned, most of these quickly turned to shovelware.
As for the rest of these on here, well, either I know nothing about the system, or I think you're pretty much spot-on with.

I'll extend this with the general popularity of newer consoles, and when they peaked IMO

PS2: 2001-2007 (2004)
Xbox: 2001-2006 (2004)
GameCube: 2001-2005 (2003)
Wii: 2006-2010 (2008)
PS3: 2009-2013 (2012)
Xbox 360: 2006-2012 (2010)
DS: 2005-2011 (2007)
PSP: 2005-2008 (2006)
3DS: 2011-2016 (2014)
Wii U: 2013-2016 (2014)
PS4: 2014-2020 (2018)
Xbox One: 2014-2019 (2015)