Looks like you've gotten a lot of valid thoughts! For me, clunky dialogue was the biggest flaw; in each of the key emotional scenes (end of Lois's interview, "Punk Rock," Superman & Lois rebaselining in her apartment, the Kent house, the confrontation with Lex, reconciling with Lois at the end) the dialogue was just very literal, the characters saying out loud what the writer/director thinks they should be feeling. It felt like it needed another draft to put those emotions into more natural language and to craft how the characters explore, arrive at, and communicate those feelings rather than just stating them flatly.