There are an alarming number of ways in which 343 attempted to build a successful game by mimicking COD:
1) loadouts
2) grenade indicators
3) killcam
4) ordinance drops
5) point system, instead of kill number
6) ** Spartan Ops, comparable to Spec Ops
Halo 4 nerfs good players, and tries to make the game interesting to new players with easy kills and unlockable abilities. In reality, 343 has ended the unique and competitive experience that was Halo.
This "evolution" is just an attempt to outsell COD.
Bungie is laughing their heads off, as 343 attempts to outperform COD by imitation.