The dive move is so ridiculously useful. Best move is diving towards an enemy then punching their legs out from under them. One of the benefits of a focus on gameplay is that the new moves and mechanics actually get used, unlike in MGS4 where you could only put most of your skills to use for about 1/4 of the game.
The balance between all the different mechanics and weapons is just insane. It was only when some enemies started wearing full riot gear that I was forced to see just what was really possible and take different weapons / items, and despite knowing how deep the game was after 30 hours of play it
still blew my mind what I ended up being able to do.
In fact, I found myself thinking something quite humorous. I would get pissed off when there was a move or action Snake couldn't do. Then I wondered why. I decided that Snake's character is in the 'interactive uncanny valley'. Most game characters can do like 5 things. Swing a sword, cast a spell, run, jump etc. Snake can do like 100 things. He does so much, and it's so intuitive, that you subconsciously start to expect him to do anything you could imagine him needing to do out in the field and if he can't do it you're surprised. I mean, I remember being on my back shooting at some dude and I was just like, 'fuck, roll away!' not knowing I could roll, and I pressed the stick and he did. Ludicrously good levels of animation and interactivity... leading to the uncanny valley.
Or the way he rolls on his side while aiming up a shot if the target is moving... stuff like that is just awesome.