Seriously, there's no Tron in Tron. How can anyone call this a Tron movie without showing the title character even once? Hell, there was an opportunity at the beginning of the movie when Ares invaded Encom. One of those security programs defending Encom should have been Tron. It's a missed opportunity amongst an entire movie of missed opportunities.
Further, where are all the other characters set up in Tron Legacy? Why should we care anything about this whole new crew of characters that seem to have no real connection to the previous stories? Legacy actually set up the possibility of an interesting sequel. Why aren't we getting that?
As for Leto, the guy can't act. Please, please, please stop putting him in movies.