My tastes haven't changed so much as the market at large has.
Always loved RPGs and adventure games, and N64 Rare games were some of my favourites. Of course, such games don't really exist any more these days, but maybe Yooka Laylee will scratch that itch.
FPS games I've also always loved... But single player, or with one or two friends. Star Wars Battlefront 2, and Battlefield 2, will remain my favourites here. Modern shooters I would like more if they had extensive single player with bots and ect., but that's a rarity so most of them I don't really play that much any more.
Always loved 4X games, Civ being one of the first games I played. Of course, on the downside, most new 4X games are released rather unfinished and in dire need of balancing patches, so it takes a while before they're really worth playing over older titles.
RPGs I've always liked, but we're entering the era of Action RPGs, with few of the older style RPG. Action RPGs are ok, but they're not really that well designed for the most part these days.
I could go on, but I think we get the point. My tastes haven't really changed, and my top games are still my top games... But a lot of the modern renditions are losing the best parts of those games, as we go from focusing on creating fun games, to market tested mass-appeal and rapid release with post-release patching. I'm not going to pretend things were perfect back when, but a lot of things were different, and in some ways better.