I hated how, once again, we got a Lex that just lazily lets alien technology do the hard work for him. It would have been one thing if Lex took Zod's body into his lab and experimented on it, ultimately turning him in Doomsday or Bizarro. Instead, we got another case of "Lex walks into [INSERT ALIEN FORTRESS HERE] and asks the computer to do something for him." It reminded me of the part in Superman Returns where he waltzes into the Fortress and Jor-El tells him that Kryptonian crystals are apparently the comic book equivalent of those little action figures I had as a kid that you put in water and then they grow 10 times their original size.
Stupid, lazy writing. Hey Terrio, pick up a damned comic book. Lex has come up with plenty of doomsday weapons all on his own without having to resort to "Hey do this for me while I watch."