Most of you will have played a Guitar Hero or Rock Band game before. This game functions in exactly the same way - you get to pretend to be a hero on guitar, bass, drums, or vocals.
The new stuff that's great are:
* Joining in any time: excellent for when people just want to join in, no pressure. They can even drop out if they fancy it, again no worries.
* Not just a regular band line up: as already stated, you can now have duplicate instruments (or even 8 of the same) so no one needs to argue over who gets to be the vocalist. The downside to this is in the trophy set - you need 8 on the same instrument to get one of the bronze trophies, which takes a lot of co-ordinating (you can only have 4 local instruments, so the other 4 must be online players).
* Diverse tracks: the tracks are more diverse here than in previous Guitar Hero games. However, maybe it's partly due to my own tastes in music, but I feel that a lot of the tracks really suck. There are lots of songs that I feel are "middle of the road", e.g. Bon Jovi. How many more times do I have to listen to a Bon Jovi song? There's not enough rock and metal music, which is why ultimately some gamers (such as me) prefer Rock Band/Rock Band 2.
This game is still fun if you play along with friends. But the overall experience isn't great because of the tracks. Yes, you can import songs from Guitar Hero World Tour, but it only imports about half of them. I was hoping it would import "Some Might Say", but that didn't make it, neither did "Beat It" or the Joe Satriani song. In that respect, it's a disappointment - hence the average rating.
If you already have Guitar Hero World Tour, forget this game unless you're after easy trophies (although some are frustrating, but still easy in terms of skill level). It's not a bad game, but in the grand scheme of things it's also nothing special. At least The Beatles Rock Band had three-part vocals, which was something VERY new and different.