Good, but not maximized.
Anyway. I must say, they made a big step on graphics. Wonderfull. Now concerning gameplay, because that's more important in my oppinion, isn't really worked out well.
Some corners can go very fast in comparisment with slow corners. You cannot drive a clean lap the first time you enter a circuit, at least I can't, last riding on the edge. One other big issue tho is the overtaking behaviour of the pc bikes. Sometimes on the straights they seem that they don't want to pass you for some reason while they got loads more speed! They just hold throttle back.
That's really odd in my oppinion and shouldn't happen anno 2007.
Another big issue is the music. I'm sorry not everybody likes punk/emo rock. Besides from that, even if you like the music there are just a few tracks so you keep hearing the same over and over again.
The customisation of your bike is nice but it was easier in MotoGP 3 URT. I don't know, for some reason this game did improve but some parts are left behind and not so worked out well as other racing games are.
My verdict is a 6.5. With just a few more months fine tuning, this game would get a 8.5 for sure thought. To bad, missed oppertunity to really impress!