Going in as he's gaining in the polls the most important thing Trump had to accomplish was not self destruct. Unless they can turn one of the very mild wisecracks into a scandal he's going to walk away from this one without a scratch.
What Trump failed to do is move. But that goes both ways. He didn't gain, but he didn't lose. And he had a lot to lose. It may be that Trump himself chose this strategy. He's the nominee because he has a gift for knowing the right play in most situations. I'm reminded of how he went easy on Ted Cruz in one of the debates where the moderators tried the old "let's you and him fight" trick. Trump just kept his cool and patted Ted on the back.
This wasn't as much fun as that, but then Hillary isn't much fun under the best of circumstances. Trump is playing it very cool. He was a lot harder on Jeb. I'd call the debate a draw, which if Trump is indeed the front runner means: Advantage Trump.
OTOH...as nasty and rehearsed as Hillary was, she probably won some idiots, by play at being BLOODY KELLY with the stupid Rosie O'Donnel name calling crap. Will her smirking, snarkiness, hypnotized, horror movie type grin ( A la THE MAN WHO LAUGHS and the Joker in Batman movies ) lose her anyone? I doubt it.
But he has to do better next time and stop worrying about that horsefaced "delicate flower", oh so "special" Chels!