I've never had this much fun in a game in a long long time. Prototype is everything that I wanted from Mercenaries 2, and more.
The good
Alex Mercer and Helicopter Hijacking
Mercer seems like the rejected child of Venom and Hulk, and his powers are just so fun to use, and it never gets old to jump out of your damaged helicopter, and grappled on the next one, and listen to the rather well done military chatter of the helicopter pilots whose life now hang on a thread as Mercer start ripping off their cockpit before tossing the gunner into oblivion and then proceeding to break the pilot's neck.
Fight, fight, and fight ...
Next, the fight are chaotic, and chaos is good. The three way brawl between Infected, Humans and Mercer never gets old, and going into the contested zones to annoy both Marines and Infected is as fun as it sounds like, steal a tank, blow a infected hunter into pieces or just go in with your bare (mutated hammer) hand and watch them wished they had stayed home or in their hives.
I has wings ... kinda
Oh, and how could I forget the main reason I am enjoying this game, the 'parkour', yes, it's not realistic, and hey, I said realistic, about time I played a game which wasn't trying to have a physics simulator between the way of freedom and gravity.
The bad ...
And like anything good games, there are always problem to be found. Uninspired finale which wasn't epic enough for me, like a certain fight with a certain Elizabeth Greene which was good and a fight against the final boss which was sub par, at least, considering you were fighting a perfect "clone" of yourself (Spoiler aside, nah, it's not a clone of Mercer, but you get the picture of someone with the same power as the 'Man'), and the inability to explore hives a-la military base.
The broken stealth game can be annoying as well, it's just too damn easy to consume an entire base without anyone noticing that the guy they were talking to about a minute ago is gone, and his weapon lying on the ground.
The fact that I can randomly kidnap someone and run off, do some demonstration of inhuman feats in the middle street, in broad fucking daylight, sometimes make me feel like in the "World of Prototype", this is just normal occurrence and there is not a decent enough game play mechanics at play to hamper you there, like you know, cops and swat teams going on a hunt to cap your buttocks.
However, after hours and hours of attacking random military personnel to catch the attention of those pesky humans, I can say that such a 'realistic' approach to the inhuman Mr. Mercer running down main street wrecking havoc, would just mean hampering your game play too much by throwing swat teams at you every time you would leap from one building to the other.
The last thing I'm going to say about ...
Prototype is fun, and if fun is to be found in a game, then surely it must be worth the $54.00 spent on this game. Now, if you may, I have to beat the game a second time to unlock Hard+.