IGN - 9
Gamespot - 8
Destructoid - inprogress.
The 3 most important review sites with Destructoid being the best. A Grindy fighting game? Uh yeeaaa? What fighting game series isnt grindy? Your lost Definitely. MK is leader in regards to a fully packed fighter.
I think Smash Bros have it beat. Still lots of content in MK games though.