Its kind of hard to determine scores. In IGN an average game like NFS Nitro got 8.5, but monster hunter tri got 8.9, and MPT got 9.5. This game got 8.5 (not very sure) mostly because of glitches story and lack of something unique besides controller setup. Gamespot gave it a 6 (not sure exactly), for the same reasons, and gave MP3 an 8.5. What I noticed, is that the story mode gets more attention than the multiplayer, so improving it in every way possible (the story mostly) can boost the score up.
Considering other scores: Ign: worst 8.5 -> 9.3 best Gamespot: worst 7 -> 8.9 best