Outstanding in all ways.
Gameplay: 5/5
The gameplay is spot-on. People may complain about cutscene length saying: "Oh i heard from so-and-so that MGS4's cutscene length is 20 hours of the 25 hour game....." Wrong. The cutscenes are perfect length (although you could argue about the FINAL final cutscene). The game is great as well. Shooting, cover, camouflage, boss battles, sneaking and vehicle sequences all work very well with the reworked camera and control scheme. You can buy weapons and unlock ID'd weapons from the gun launderer Drebin for currency known as Drebin points.
Graphics: 5/5
Everything is polished, clean and beautiful. No pop-in, and the use of lighting is spot-on.
Sound: 5/5
The voice acting is great (if not a LITTLE melodramatic here and there) and the music fits the situations great.
Value: 5/5
There are bonus weapons, achievement emblems you get at the end, and you can carry over your Drebin points, items and weapons after each play through. You can also download additional things through the extras menu like Ipod songs and camo patterns.
Multiplayer: 5/5
MGO (Metal Gear Online) is the de-facto multiplayer experience on PSN now (its up there with CoD4). You can decide how your character looks and their skills they carry into battle with them such as weapon mastery and special abilities. You can choose your equipment loadout at the start of each match. There are (i think) 6 maps to play on.
Overall:
If you want a good game, go buy this one NOW!!
Final score: 5/5
PS: Just letting you know, the 40-100 hrs includes 3 full play throughs and MGO.