I've said before that the lack of contextual awareness in the AI for animations is an issue. For instance, there will be times where the skater is in close, so you drop into butterfly. Then, when the shot comes low, your goalie will hop upas if he's trying to save a mid/high shot, thus giving up a low/5 hole goal he would've otherwise saved.
From speaking with other goalies who play competitively, I think the consensus is that we're tired of our goalies reaching out like stretch armstrong to save great shots painted for the top corner, but our goalies constantly giving up goals on simple shots because the puck hit us and bounced around our pads and in, or the goalie having the puck sitting in clear view right next to him, but not being able to cover it, or goalies constantly fumbling the puck instead of just catching it cleanly on simple wristers, or the game thinking we're screened because a player is standing slightly off to our side while our goalie can clearly see the puck.
It's interesting to me that, in an effort to make playing goalie less frustrating, they created the tether system - something no goalie main asked for, and something barely anyone uses, but completely ignored the issues discussed above which are some of the main sources of frustration with playing goalie.