Without smart tactics or voice chat, the overwhelming volume of adversaries - that come from all of angles - brings your group with their keens. If the enemy doesn't see sneaking through to him from behind or his side, then he can not cry in the market to alert his comrades nor could he have a chance to fire his weapon. One final gripe - the final third of the overall game is 100% carbon copied from your previous game - I'll prevent the spoilers, but if you've played Uncharted 2, you'll know what I mean when you see it.