I'm a huge hockey fan, been playing for 18 years.
I'm really impressed with how NHL 13 and NHL 14 are focusing even more on realism.
I like how they incorporated the momentum in the last game. They really smoothed it out in NHL 14, all the pivots and hard turns are a lot smoother.
Big improvements on the hitting. More realistic and more visually pleasing animations.
They fixed the spinoramas.
More random and realistic puck bounces
More realistic scrums after the whistle and a whole new fighting system.
Goalie movement is looking more fluid as well.
I've been playing hockey games since NHL 94, but the past two, especially NHL 14 are really blowing me away.