In offline play goalies are actually better in most ways, still some odd animations that leave me shaking my head on what it was thinking (but that is maybe a handful of games out of the 75+ I have played)
Goalies on superstar difficulty and some catered sliders are fine for the most part. A few goals here and there with odd animations and some where a goalie has a bad game (3 goals on 5 shots - but this is actually not a far stretch from real life). In a game I played last night offline, I was out shot 39 to 27 and lost 1-0 in overtime, with both goalies making some crazy saves to keep it going.
On average games are 27-22 in shots with a score from 3-1, 3-2 to 4-3, fairly normal overall - plus I am not using a team full of star players and only have one player with a gold xfactor.
It seems like a bigger issue for the online side of it, I am not sure what sort of difficulty it could be set to as default though.