GH3 had several problems, and this ZP addresses them well. I'm just going to agree and add on so...
1) Difficulty level. The Hammer-on Pull-offs were easier (the first time I was able to get them) but shit just felt difficult to be difficult, instead of challenging. I never-ever-play GH on a level beyond Medium, because I have a life with a whole host of other responsibilities I need to ignore; actually practicing to get better at this game is not worth it. However, I start on Medium, and just go; usually, with a little work I've been able to manage the other games. Not so, here.
1a) In addition, when there are 'boss' battles (which suck hippo balls) that come down to luck (which ALSO sucks hippo balls) then fuck that noise. If the idea is to pretend you're in a band, then you should have experiences that feel like band ones, not Highlander with guitars.
2) Songs that can only be unlocked in Co-op.
Some of us don't have friends who want/can help us do this, bastards. I was really surprised no mention of this was in the review, since Yahtzee has repeatedly stated how he doesn't care about multiplayer in games. Basically; there are 6 (or so) songs I can't touch without cheats. That's bullshit, since I paid my $ for the game.
3) Graphics. The graphics (at least for the PS2 version I had) were actually worse than previous incarnations.
How the hell do you manage that?
4) Tom Morello is considered one of the great guitarists by other people who play guitar. He really is impressive, if you listen to a lot of rock music. That said; I totally understand where the review is coming from. And, anyone who thinks Slash can't play guitar is out of their friggin minds. You may not like it, but that doesn't mean he's not brilliant at it. (Also true of Morello)
So yeah. This was the first time I would advise someone to NOT get a GH game. I was just really disappointed.