Fucking hilarious. XD
And even though I'm a MGS fanboy by heart, even I have to begrudgingly agree with Yahtzee.
1. It's on the PS3, a gaming console that has doesn't have much of anything going for it except for 4-5 exclusives, including this, and a few unique features.
2. The cutscenes were un-fucking-believably long, with minutes of gameplay sandwiched between 20 minutes to a hour of cutscenes. If you take those out, the game is ridiculously short. It took me 20 hours to play through the game the first time and I think it would be half that if the dialog was taken out. I swear that after the fight Raven, it took over a fucking hour to get through the Hollywood type "Oh all is lost, the bad guys are almost winning" shit. [Also note that while you DO get to play with Metal Gear Rex, it's about 10 minutes long with a easy boss fight against Metal Gear Ray with a 35 minute scene afterwards.]
3. The stealth gameplay is good, especially if you like the MGS type of sneaking, and it improves upon the Camo system from MGS 3. Unfortunately, the QCQ and weapon firing system is a big CLUSTERFUCK. Having to grab someone from behind, take out your gun, kill baddy with your human shield, then throw your hostage to the ground and make him give up items and weapons sounds pretty good at first until you read the instructions and find out that it takes like 6 fancy button presses. I can't tell you how many times I tried doing this on my first time through and failing; then I said 'Fuck it' and proceeded to kill everyone with a M4.
4. The game is exclusively for MGS fans and the fans only as it's the only way to really enjoy it. Anybody who doesn't know about the last 3 PS1\2 games won't understand a damn thing and proceed to be lost in the dark from there.
tl;dr: Let it be known, this is a fanboy game. Don't go in unless you've played all the others and liked them.