If you play enough of the game, you'll notice that it becomes extremely repetitive..

User Rating: 7.5 | Prototype (2009) PC
Aside from what's been said already. I can't help but emphasize that the game is way too repetitive for my tastes. There isn't much "technique" involved for the combination moves if you choose to not focus on them (at least for the medium rating not "hard").

Even though I did enjoy the game for a while. Eventually, at some point, you will notice the repetitive nature of the game.

Go from point A to point B. Run, grab, kill, run, shove aside civilians, disguise yourself to escape military harassment, run, run, grab, kill, repeat ad naseum.

Even though the game 'attempts' at some variety, you're basically dealing with civilians, the same basic soldier, tanks, helicopters, zombies, and the big mutants.

The same units for every part of the game.

Don't get me wrong, the game has it's moments of fun. However, I wouldn't give it a score over 8.5 at most. Still worth some of your time.