Personally I dont think it is. Mainly because any other title would either sound tacky or be pretty much the same thing. Any mention of DC, followed by any other word (universe, superheroes, comics etc) would mean just as much to anyone!
Calling it something like Mortal Kombat vs Batman and friends, would get instant recognition, but would be gayer than a night in with Snarf!
Plus, by using the name DC Universe in a game like this, then the MMORPG, at the front of movies and on cartoons, will create the branding for any future endeavours outside the comic medium.
And anyway, I know enough non-comic book geeks who have already bought this (or are planning to by it) as they know it features Batman and Superman, characters that are instantly recognisable to Joe Public!