I think it's great, based on what little experience I have of it so far!
Was on a patrol off Scapa a week ago or so, and my watch failed to spot an AC coming in with a sound mind of bombing us to smithereens :p I however saw her just in time to save our bacon, and promptly ordered a crash dive... well, the bugger DC'd us after we had just submerged, w/ a result of the boat being blown back to surface because the charges exploded under our keel! Survived, however, and lived to fight another day
Yah, it's great IMHO.