Well, you do love Assassin's Creed. Ba Dum Tish.
The tone of the movie was a mess and tried to make Superman a brooding, dark figure. Superman can be a serious character who is seriously frightening when presented from the POV of the villians, but he's essentially a golden retriever. He fights for truth, justice, and the American way. A common excuse given by lazy screenwriters is that this sort of character is too one dimensional or that the current world is too cynical to buy into that type of character, but thats a cop out. Captain America is a hugely popular Avenger and he's written exactly how Superman should have been. Snyder tried to make Superman in the same tone as he made Watchman. Its a terrible decision.
Screenplay was boring and overly long, wasting a bunch of time establishing a backstory that every moviegoer largely knows beat for beat while being overly serious and leaning into Christ imagery so often it could become a drinking game. Villians also had an extremely boring motivation (We want to terraform Earth) and method (We have big laser). Michael Shannon was totally wasted in the role. Amy Addams also had no chemistry with Cavil.
The action also somehow sucked. I'm not a guy who agrees with Red Letter Media often these days, but Mike described the last battle with Zod as being indistinguishable from a scrambled screen with white noise after the first 3 minutes. I still remember him saying that because it reflected my experience so well. It's the only movie I can remember giving me a headache in the theatre because it was just a wall of noise.
Then it ends with Superman breaking General Zod's neck and crying. Fun!
Lastly it established the busy/drab/ugly design philosophy that would carry over to the whole DC Universe. Anyone who wonders why the Marvel movies won can look at the visual appeal of Iron Man versus Man Of Steel and have their question answered.
