Mass Effect 3: Shepard's Dynamic Stabbing
Bioware have put out a video focusing on Shepard's improved animations in Mass Effect 3, which you can see below. The clip shows off how his reactions when taking cover are more nuanced, and also shows how melee is made a little smoother and more believable with improved animation syncing. It's quite an interesting insight into the little tweaks that the devs are able to make for the third game, and it shows the designers demonstrating their combat in a test scenario, which makes the improvements on the original character animation really stand out. Skip to 1:20 to get past the "community" blatherings and get to the meat.