Unfortunately, as fun as the combat is it does fall into repetitive missions structure, and after killing loads of generic bad guys things can become stale. (cogconnected.com)
The good part of the game doesn't start till your half way through and then you have to do a bunch of repetitive missions. (metacritic.com)
This is due to the fact that the game suffers greatly from repetitive mission design, poor enemy AI and confusing exploration. (justpushstart.com)