WWE Wrestlemania 21 is indeed an improvement over the abysmal Raw series, but only a minor one. Perhaps they got it upside-down and actually meant to reward it '01/6' - which would've been a lot closer to the mark for this disappointing return of wrestling to Xbox.
There's a logo printed on the front of the box saying this game was given '9/10' by some magazine, but we think there's probably been a mix-up at the printers.