I started writing out a list of my top favorite games, and up until ~15th place it was all games from the 90s.

Part of the problem (for me at least) is that the genres I like are either no longer mainstream, or popular. I love games like Donky Kong Country, Super Mario, and especially Sonic & Mega Man X. Unfortunately platformers are very much out of vogue. Though they do get some love on portable consoles, I just don't feel the same effort going in as they once were. New platformer titles seem to just be throwbacks to attract retro gamers, but the old platformers that were made were meant to be masterpieces. (Not saying I enjoy the don't enjoy the new titles, they just don't feel as inspired)
You could say I am just being nostalgic, but I didn't even pick up my first Mega Man game until 2006 and I still think the ones from the 90s were the best.

My other passion is JRPGs, and I strongly dislike the way the genre has moved in the last decade. (Not to get into that here.) Combine that with the growth of the market share of WRPGs (which I don't like), and you can see why I look enviously back to the days of yore.