JRPGs. I wrote a lengthy blog on it once:
http://www.cheapassgamer.com/forums/blog.php?b=2034
Let's just say I was somewhat into JRPGs, but FFVII got me into the genre MUCH more (my favorite one ever). I bought almost everyone that came out on PS2. I use to spend all day inside playing JRPGs when I finished my homework. I skilled socializing with people just to get more time to play JRPGs. 2006 was a year I was really excited for because a JRPG in just about every series I love came out. Unfortunately, I only played a few of them a lot while most just barely got played. I kept buying them in 2007 and some in 2008, but most got ignored. The most time I put into any JRPG in the last two years was Eternal Sonata (360 version), for 12 hours, but I traded it away and switched it for the PS3 one (which I put 5-6 hours into so far). Let's just say on 360, I only really played Eternal Sonata and played Lost Odyssey for 5 hours. I tried Blue Dragon and hated it (got rid of it). Not a fan of Enchanted Arms (got rid of it). While ToV seems good, it's just not hooking me in (I played more PGR4 and Lost Planet. I could even say I played more Castle Crashers recently). On PS3, didn't play Enchanted Arms much more (I got rid of it). Disgaea 3 has done decent (just haven't played in a while). I need to play Valkyria Chronicles more (I ended up playing Resistance 2 instead). I played Eternal Sonata early on, then moved onto LBP and other games once I picked them up. Handheld RPGs just haven't been played much (I barely touched Star Ocean: FD on PSP). PS2 RPGs NEVER get touched anymore, and I'm still sitting on a bunch.
I actually enjoy whiny characters and storylines in JRPGs, I just don't have the patience to sit through them anymore and level up. In ways, I'm kind of having more fun leveling up in FPS online, and I use to hate FPS more than anything.
What I hate is that I still feel the need to buy JRPGs, yet I rarely play them now. I find myself playing online games, music games, fighters, and racers the most these days (where everyone does exceptionally well). Like I'm kind of tempted to buy Infinite Undiscovery, but I'll probably never play it. Next year I'll probably buy Star Ocean 4, White Knight Chronicles, Star Ocean: 2nd Evolution, Last Remnant (PS3) and probably barely play them. But since money is tight, I'll use that as an excuse to not by.
In other genres:
Platformers - Slight decline, only because there just isn't many, but I still love them when they come.
Fighters - About the same. Some series I like just aren't there this gen yet, but having online play is great.
Music - Non-instrument type decline (just not many). Instrument type, HUGE increase. While my DDR interests decreased, I truly LOVE SingStar, Rock Band, Guitar Hero, etc.
Racers - About the same, but probably spend more time with them now due to online.
Action/Sword - Decline. Most I buy, play for a little, then never play again (looks at DMCIV, NG games, and many more).
Action/Shooter - HUGE increase. I use to hate them, but now I play them a lot more. FPS I hated with passion, now I like.