Full disclosure: I have no rooting interest in any of the teams that have been fortunate enough to play in the regionals.
Without rehashing the controversial plays that have already been rehashed numerous times, let me simply agree with an earlier poster and grade the officiating as a D+ -- at best, for the following reasons.
--Far too many "ticky-tacky" calls for an NCAA regional series. The most egregious examples that I saw were the performances of the ECAC crew that worked the BU-Minny game and the Hockey East crew that worked the Cornell-Ferris game. The interference call made on a Cornell player that led to the first Ferris goal was totally bogus. The Cornell player simply used his speed to gain inside position on the Ferris player, which is what you're supposed to do.
--The outrageous action by the WCHA crew that allowed the Union open-net goal to stand, even though an attacking player was at least ten feet offside. So far as the possibility of the play being legal because of the delayed offside rule goes, I watched the replays carefully and IIRC, there is no doubt that the offside player had not "touched-up" at the blue line when the puck entered the net. But that's irrelevant since linesmen are supposed to kill the play immediately if the puck is shot on goal to eliminate any possibility of a disputed goal. This was an egregious blown call by this crew that denied the trailing team a fair chance to tie the game. And the blame doesn't stop with the front linesman/AR. His line/AR partner is supposed to be backing him up and there are also the two referees who can overrule any line call. In total, a colossal epic collective fail by this WCHA crew.
--The CCHA also doesn't get a free pass: The Mark Wilkins call on AF in the last minute of play should go to the ticky-tack Hall of Shame. A marginal call at best with the game on the line and the trailing team unfairly denied a chance to tie in an extra skater situation. Just an appalling lack of discretion IMO.
One thing to remember before we walk anyone to the gallows, though, is that somewhere up the line there are administrators and supervisors who influence how games are called. If the officials think the higher-ups want then to call tight games, then that's what will happen.
Be that as it may, the problem with college officlating, from my vantage point, is that it tends to be more of an Old Boy Network as opposed to a meritocracy. This is especially true in the east. The result is that the guys you see in post-season play are the senior lodge brothers and not necessarily the best and brightest that the various leagues have to offer. There are lots of really sharp young officials being produced by the USA Hockey Officiating Development Program but the D1 college leagues either marginalize them or ignore them completely. Unfortunately, I don't see this changing anytime soon.