Just plain amazing!
Though i didn't realize it at first, [PROTOTYPE] seems to be a "Love it or Hate it" kind of game. In my opinion, the game did have a slow start, which may of scared away many people into thinking the whole game was going to be like that. Well it isn't.
Every aspect in this game works great. Web of Intrigure targets found all around the city work alot like "The Deck of 52" in Mercenaries. Infected and Military zones constantly change with each mission you complete. Mercer has dominance on everyone in the city. And much, much more.
Though I'm a little dissapointed that Co-op was cut just before the game came out, its a small price to pay for a truly outstanding game. Just go buy it.