If you liked Guitar Hero 1, you'll like this just as much.
It's a good sequel, but it's mostly tailored toward people who've played previously I feel. There are some major jumps in difficulty.
All the same, if you enjoyed the previous entry you'll likely like this one.
My only real complaint is that the playlist doesn't appeal me so much as Guitar Hero 1. Though not particularly important in a game such as this, the graphical style is decently attractive. Again, not particularly important cause you'll be too focused on playing to really mind the happenings in the background. If you liked Guitar Hero 1, you'll like this just as much.