Negatives:

The dream sequence is complete nonsense and unnecessary. Yes, it's a little bit interesting see-ing Batman get in head shots and gun down every bad guy in sight and the scene where Superman unmasks him. It was all a dream though and lasted several minutes, why include this?

The scene where Clarke talks to Kevin Costner in his head? Again, unnecessary.

Who the fuck thought they needed to include yet another flashback/Batman origin story. We've seen it multiple times in the past few decades. Everyone knows it. It's silly just to remind the audience that Bruce's mother's name is Martha.

The Man of Steel soundtrack being played constantly at different points throughout this film. It's like they really could not afford Han Zimmer to record new material, so they just re-used it all. It also tends to happen at these supposed "sentimental moments".

Doomsday is wasted in this and it's completely forced. He doesn't really do anything either.

The CGI. I understand that this probably started off as Man of Steel II, but it just feels unnatural. One of the best things about Nolan's films is that it doesn't feel like The Avengers.

Superman dying when we know he can't. Bit of an issue too since in TDKR which this borrows heavily from, Superman practically dies after the nuke, then is revived by the Sun. Hence why it's more believable that Batman is dead instead (I guess though The Dark Knight Rises already done something silimar)

Wonderwoman being all over this film, but not actually having her character's motivations explained. She just appears randomly and the photo sub-plot makes no sense. Why would she care?

Lex's motivations are never explained either.

Positives:

The Amy Adams bath scene on a big screen in the cinema . It made no sense and was obviously only made so they could put it in the trailer to tease a sex scene in a 12A rated film (PG13) though.

The film if you exclude the Batman origin montage during the credits, looks like it might actually be pretty good until the 2nd dream scene nonsense (batman killing people in Syria or wherever).