Man Of Steel. One of my favorite CBM's. It has some flaws (Lois Lane shoehorned/contrived to arrive for/be in action scenes, Adams being a poor Lois and having no chemistry with Cavil, the kiss & drone scenes, the Jor-El GPS scene, some bad dialogue here and there) but overall it was a very good movie to me. Zod is one of the few villains in these CBM's that actually felt like a real threat. Cavil is great as Superman, though he could've used a few more lines. The action was great, the visuals were great, the story was good enough to keep me interested the entire way. First Flight, Smallville fight, You Are Not Alone and yes, the Zod necksnap are all great scenes.
Batman Vs. Superman. It just dragged in too many spots, Eisenberg is GOD AWFUL, the story was stupid, Affleck was average at best, the reason for Batman/Superman fighting was not good enough, the fight was actually underwhelming, Martha!!, Doomsday was awful, Dream Sequence was horrible, pointless and shouldn't have made final cut, Death of Superman was unnecessary and way too early in the Franchise. Not an awful movie but just too many bad decisions and horrendous villains.
Justice League. This movie is just kind of there, there is nothing particularly awful about it, other than Ezra's awful take on Flash and a handful of crappy jokes (thanks Joss), but there is nothing remotely memorable about it either. Not horrible, but not good.
Man of Steel by a mile.