I've got both 06 and Unleashed for the 360 and have never got anywhere near finishing either as they both pissed me off so much. I keep feeling like there something I need to put myself through just so I can say "I am an 06 survivor".
It depends what /10 scale you use. There the one Renokc mentioned then the true /10 scale where 1 means rubbish 5 means average and 10 means amazing etc
The problem with the /10 system as well, as someone put it, is that some gamers tend to rate games that get below a 8 as instantly crap, which is stupid and bloody annoying. A 5 star system is definitely more accurate in that regard.
Now what a coincident. I found Sonic Adventure 2 battle on a collectible gaming shop, when we were in the cinemas. I got it, now the only thing left is that I have to go and get a GC controller and memory card. Can't wait to play the game and say my opinion. I looked at the manual and it looks great.