Prototype was good for mindless action...
But unfortunately, as the author worded quite well, that will eventually become boring. I enjoyed the original Prototype but many aspects were far too limited for my taste. You could consume people after which you could take over their personality. So far, so good.
But only when consuming /specific/ people; it didn't stick. For example; a terrified person comes up to you, you consume him/her to replenish your health. Then I'd expect to know what scared the heck out of the guy/girl. For example; knowing where the nearby enemies are located. But Prototype never went that deep. Which disappointed me to some end.
Back in the day Prototype stood directly against inFAMOUS; after careful consideration I eventually picked Prototype. It was good fun, and it still is (I still play Prototype occasionally). But now I think inFAMOUS is the better of the two. The side missions in inFAMOUS added to the whole storyline and expanded heavily on the feeling of being in a city which was in total anarchy. The Prototype side missions on the other hand were mere tests. Race to the top of a building, glide to the spot marked X, consume as many people as possible, etc. It was fun, don't get me wrong, but it never added up to the story of the game itself. Within that context the tests never made much sense...
When looking at the inFAMOUS sequel I think its obvious that Sucker Punch (company behind inFAMOUS) realized all too well that this stuff could get repetitive. And so they added a state of the art (IMO) editor to the game. Some critics considered it a sign of weakness, but owning inFAMOUS 2 I think it was a sign of brilliance. Even now I enjoy messing with it; not bad for a game which storyline you could finish in a few days! The editor is easy enough to let anyone work on it (you don't have to be a graphic artist to build up a story) yet advanced enough to really build something deep.
Prototype 2 otoh... I still think it'll be fun, but I'm not quite tempted to get it, maybe second hand or after a year or so at a (heavily) reduced price. It simply seems to be more of the same.