I used to love flashy, obnoxious, and usually vapid arcade games, particularly beat'em ups. I also made a point to get at least one racing game for every console, until I realized I rarely played them. Same with fighting games - a few hit the sweet spot, but most were wastes of money.
I was in love with JRPGs up until the end of 6th gen...guess all it took was one gen away for me to wish them to come back.
Generally speaking, I loved Nintendo until the Genesis came out...but after a few years of staunch Sega fanboyism I felt the grass was greener on SNES (at least it sounded better). Then Sony won me over with the then superior format. I've dabbled with others since, but have mostly stuck to Sony systems since.
Perhaps less of a taste thing and more of a reality of life thing, but I rarely replay games now and dabble in digital content, where previously I was physical only and played games to death.