I have checked out some of the reviews, one of those being the Eurogamer one.
Now, bear in mind I've no intention of playing MGS (only because I haven't got a ps3, and that will change). I'm no 360 fanboy either, I hate most of it's premier titles -- Halo, GoW, PGR, Dead Rising, etc etc. So I consider myself fairly neutral. But the Eurogamer review comes across as objective and honest. It speaks highly of MGS, but at the same time there's no creepy Hideo reverance, or slavish devotion to the series.
You might be disappointed with the score they gave, and that's fair enough, but the Eurogamer review is the best one of the lot. And as 4 pages, it's thorough too. Far better than others that only offered two pages of gushing drivel.