It's funny, my Wii usage has actually been increasing lately, in part because so many games got pricedrops after the christmas aftermath is over. Meanwhile the 360 is still gathering metaphorical dust because there's nothing available I want for that thing. Probably just me though since I consider HD graphical design offputting and wouldn't pay more than ~40€ for a game sporting it and that's if the game is very compelling, the value for less compelling games is significantly lower.
Anyway, if you think the wii's genre selection stinks you're probably out of luck on any system except the DS, the HD systems have about four genres* (FPS, RPG, racing, sports), the PC has everything the HD systems have plus the RTS, better controls and a MASSIVE supply of casual games... All systems have a massive lack of variety these days, the core gamers have pretty much contracted to the pool that likes gritty and gory games with most of the PS2's buyers in limbo.
*=Cue the lists of single titles in random other genres... small numbers of games don't count because they don't make a dent