I put 36 to 40%. Some bumps. Noticeable ones. But no plot holes, like Superman Returns, thank goodness.
The way his father died was dumb. Him being a drifter was too Bruce Banner for my liking (which was an annoying chunk of the movie). The oil rig segment seemed unnecessary. I think the destruction of Metropolis was a bit much. We needed more Superman saving people. You could easily argue he was greatly occupied, but still... Hold up one of those buildings for people to escape. And for only a thousand plus people to have died?! Unlikely.
I think Snyder has said approximately 5000 died during the Black Zero event. And as we will see in BvS that will have very fateful consequences.
What I think upsets many fans is that Man of Steel is a deliberate and very ambitious
reinvention of the Superman
myth. It explores Superman as a mythic character, or an archetype, first and foremost; and in that sense what Superman means to the American psyche is getting a kind of '
rebirth'. In that sense Superman begins this new trajectory as more of a lost, wandering soul akin to the ancient Greek demigod heroes. The reason for that? Because that reflects what the archetype is going through
as he gets reinvented in our modern, real world, and in our modern cultural psyche. (Btw, that isn't wishfully read into the film by intellectualizing fans (like me

), either. There are plenty in interviews with Snyder that explicitly back up that assertion.) Snyder had to have known he would alienate a lot of fans with this approach.
So in this sense, the above response to the film epitomizes the struggle of Superman to break free from the constraints of the cultural identity that America crystallized for itself during the 1950s, and still holds sway for many. MoS's Superman has left that world and now exists in a denser, more intense and complex, grayer world (literally).
I'm not saying that there aren't things that I wish had been done better for MoS. There are. It's not a perfect film. But I think when one understands what the film is about conceptually, and how Snyder works that at a symbolic level, it takes on a whole different meaning. Imho, Snyder is truly an auteur. He is using film and the Superman character/tale to explore myth-making.