GH3 is freakin' awesome.
I'm totally in love with about 3/5s of the tracklist. "When You Were Young" is especially fun to play, and both "Reptilia" and "Helicopter" are decent challenges. Plus, "The Seeker" and "Cherub Rock"? I really want to jump around and bang my head until I give myself whiplash when I play them.
Note: playing with a Wiimote as the secondary controller on Co-op actually works fairly well. A friend and I were able to demolish Medium in short manner last night with me playing lead on the Wiitar and him covering rhythm/bass on the Wiimote.
Spleen: I know what you mean about the graphics now, but the only thing about them that really pisses me off that much is the animation. It's bloody awful. The models aren't that bad but the animation is so spastic and in some cases entirely broken it looks like an early N64 title. It's like Activision or Neversoft or RedOctane or whoever's to blame didn't put any effort into the graphics because they figured they could just fall back on the old "oh, it's a Wii, graphics don't matter because it's all about the gameplay/controls" excuse. Yeah, if it weren't for the great tracklist I wouldn't really accept that and be happy when paying the same price as PS2 owners for what is essentially an empty shell of a controller. Don't fail so hard next time plzkthx.
Also, is it just me, or are boss battles insanely more difficult than anything else? Playing on Medium, I haven't been able to beat any of them even once. My last try on Slash I just failed on purpose so I could wuss out and move on. How are those meant to be done successfully?