If we're going to hang success on a name, I'd say there are plenty of names to go around. I seem to recall people liking 300
a lot, for example. Heck, Superman has a lot of name recognition. And, for some reason, even though he was most famous in a movie from back before the Internet, a lot of people know who Zod is.
It's also hard to dismiss marketing and advertisement, that widely disseminated exciting scenes from the movie, as factors that put butts in seats. They might even see that working and try marketing and advertising future films, through the use of exciting footage from them.
Seriously, the idea that all you need is a placard with one name on it to get people to come see a film is truly ridiculous. The "only reason"? No way.