As players, we've got no objection to exploring some sort of we can not significantly influence. If the enemy doesn't see sneaking through to him from behind or his side, then he is able to not cry in the market to alert his comrades nor could he have a chance to fireside his weapon. One final gripe - the final third of the overall game is 100% carbon copied from the previous game - I'll avoid the spoilers, in case you've played Uncharted 2, you know what I mean when you see it.