Gotta say, I'm a little shocked at the negative reaction this Batman/Superman movie has gotten from straight-up Superman fans. Lots of complaining that this "isn't a Superman sequel", and Debbie-Downer Hypester "michael1975" believes he'll have to "wait several years to a decade to see a good Superman film again".
Uhh, you guys know this is still a Superman movie that we're talking about here? You know that Superman is one of the two main characters, and that several characters from MOS are confirmed to be in the film as well (including Perry White which indicates it may be set in Metropolis)? You know that, chronologically, this film will take place after the events of MOS and may be directly related to what occurred? You know there's a possibility that Superman will be the focal character/protagonist for much of the film and that Batman may be the mysterious visitor/outsider? So...in theory, this is still very much a sequel to MOS, just with a different edge thanks to the addition of Batman.
With 6 solo on-screen appearances for Superman and 7 for Batman (not counting Adam West's movie), is it not time for something different? Something as monumental as what's happening here? Okay, maybe you love Superman more than any other hero and you only want to see solo Superman stories, but...does it not excite you that you'll be seeing your favorite iconic hero sharing the screen with another iconic hero? I mean, if you thought it was cool seeing Captain America and Iron Man fighting side by side, just imagine what it's going to be like seeing these two heavyweights -- the ORIGINAL superheroes -- in battle together...or even standing next to each other.
Furthermore, if you're worried you might not see a good Superman movie again for another decade, you need to realize that this Batman/Superman film...could also be good. In fact, it could (and likely will) wind up being quite amazing. Therefore, you might be seeing another good Superman movie in 2015 when this one drops.
Some people just need to lighten up and enjoy the ride. This is history in the making. It's going to literally be the Superbowl of superhero movies...except, instead of one group of fans getting pissed when their football teams loses, WE ALL WIN. It's ****ing Batman and Superman, people.