Would have liked a bit more of Martha (both alone with Clark and with all three of them), but then I am a big fan of Diane Lane. Didn't find the action sequences as long the second time through. I think my minor objection to their length the first time around owed much to having read complaints about that before seeing the movie. Will definitely be added to my shelf along with all the other superhero films I've got. Looking forward to the next installment.
Yeah compared to the neverending final battle in TF3, I didn't think the battles here dragged on too long at all. At least assuming you were still invested in the characters and hadn't completely tuned out by that point.