Yeah, so what we've got here:
Only shitty FPS games use a glue-on cover system. Duck and you will live.
Killzone 3 had the shittiest melee system I've ever encountered. It was much worse than MAG's. In MAG you could have a knife battle. In KZ3 if any random faggot decided that it would be a great idea to bum rush you there was a game-breakingly high chance that he would actually succeed in his tomfoolery. If only KZ3 hadn't been CoD on PS3, perhaps GG wouldn't have lost so much of their fan base.