This game is so unbeliveably amazing you will not believe! Prime 2 is (in my view) absolutely perfect, and I'm sure all others will feel the same way.
The game looks amazing; not even Prime 1's graphics can compare to this. The suit actually shines in this game, and it looks amazingly real (as does everything else in the game). The sound and music is still more or less the same in quality as that of Prime 1.
But the best part is the gameplay itself. Prime 2's gameplay is just as good as its predesessor, and although it hasn't changed much, is still incredible. Two minor niggles are that some of the bosses just feel like remade versions of Prime 1's bosses. The first boss is uncannily similar in fighting to the Plated Beetle boss in Prime 1, and another boss can be brought down in a very similar way to Prime 1's Flaahgra boss.
Multiplayer is incredible too; those who have doubts, I can tell you that it is very much as good as the rest of the game in quality.