The control in the water is so difficult that you'll never want to leave dry land after trying it once. The attachments are welcome additions, if only for their coolness factor, but unfortunately they aren't vital to the gameplay. The game has its other small victories in terms of innovation, depending on how you look at it. For instance, they've implemented something of a combo system to the action. If you have the right amount of a certain types of ammo, you can perform special attacks by hitting combinations of directions and buttons.
Experimentation is the key.
But, because of how much they stack the odds against you in the more difficult parts of the game, it's quite necessary to utilize your most devestating combos in order to succeed. This type of urgency can be frustrating, as a group of baddies will make short work of you, and trying to get the right combo down while timing it right can be a real bitch. Getting your ass pounded on by 4 baddies at once with absolutely no outside help is really an excercise in frustration, and the additional mission goals don't make it one bit more fun. Fighting for survival is enough, I don't want to participate in a moronic scavenger hunt on the side. Outside of those qualms, the actual game mechanics are quite well rounded.