We've talked about this in past threads. A lot of the critics & moviegoers who shytted on "Man of Steel", didn't like the movie simply because they didn't care for a darker Superman story & were appalled by all the destruction that was going on in metropolis in the movie. They really wanted more of a flabbynsick 70's Christopher Reeves Superman-type movie.
So like I said with Doomsday being confirmed as the villain in this movie, most of the folks who hated "Man of Steel" either gonna hate this movie too
OR if they do like this movie I expect them to be coppin' all types of pleas & makin excuses why they like this movie but hated MoS such as "this isn't a Superman movie, it's a team-up movie".
EDIT:
That line in your post about "Snyder learned from his mistakes in MoS and improved this film" sounds like a pre-prepared copped plea.