Meh....
Its a pretty bland game. Not much color and very low variety in the enemies. Basically, the enemies are all just recolored and given different guns. Also, big big problem, there is absolutely no way to get the last gun fully upgraded. The best you can do is get to the m-16, upgrade it, then get the final gun and spend the leftovers on it. I think it is really really frustrating that you can only FULLY upgrade one weapon in the whole game. It is a pretty darn easy game as well. Also, once you have bought all the guns, money has NO meaning what so ever. Gamers enjoy a game MUCH more when they feel like there is actually a point or reward for doing something. Basically I think the game is just meh and its an easy way to get 8 more NG medals under your belt. However, if you don't really care about medals, its not worth the time to play it.