I agree with most of Christopher's post but I've got to ask, where is the character richness and depth with Major Zod? I know the episode with Jor-El revealed a bit of his past regarding his son, and I could see how that added to the Jor-El/Zod dynamic, but I don't see elsewhere where the character has been developed all that much.
Or rather to be honest, I'm not too pleased in the directions the writers have taken him in. I don't necessarily see that as development. The awkward flirtations with Tess and then making him a generic corporate type villain, that doesn't work for me. It seems beneath Zod, well Terrence Stamp's Zod from Superman 2.
Davis was a complex and interesting dark character, but Zod seems like a one-note stock villian.
I think his complexity is more potential than actual at the moment. They've foreshadowed that the way to defeat him is to save him from himself, meaning there's something more than this vengeful, power-hungry persona we're seeing.
And to me, this character as written and acted is a lot LESS one-note than Terrence Stamp's Zod. Stamp's Zod was a megolomaniac. Nothing more, nothing less. And they never even bothered to give him a motive.
I've enjoyed Smallville a lot more since the new showrunners took over. I agree with those who think "Red-Blue Blur" is ridiculous, though.