The only problem I have with Zod is that it seems to signal a lack of creativity. We've seen Zod and his co-horts in a theatrical film; so the producers need only copy a few familiar aspects and call it a day. Why not something never seen in the theater? Why not Brainiac? Why not Metallo? Why not Parasite? Why not Bizarro? This is what Nolan did with Begins - he gave us Scarecrow and Ra's al Ghul (two never before attempted villains). With Superman they decided to just tread old ground. On its face, it's disappointing.
That said, the film may be fantastic; there's no way to know until we see it. But I go into the film with low expectations based on their choice of theme (Superman vs Zod).