The ship hitting the HARBOR is NOT the Enterprise. The saucer crashing into the buildings? That looks more like the Enterprise. However, I will say this. If a Star Trek fan got to see this movie early and didn't outright hate it, I doubt that they would kill the 1701 in only her second big screen outing.
THAT being said...the Enterprise-A didn't look this bad off after her tussle with Chang.

EDIT: Took a screenshot of the shot of the entire ship...just gonna post the image link because even after cropping, it's still a big image.
http://img189.imageshack.us/img189/4817/damagedenterprise.jpgNow, one thing I noticed. In THIS shot, the Enterprise's running lights are still on. The shot that's a close-up from above the saucer, the ship's lights are completely off. If they lived...Scotty's gonna get fired.
