I posted this in another thread:
The Klingons should have subdued ridges during this time period, as per their dealings with Eugenics DNA manipulation, during TOS they didn't have ridges at all, but slowly gained them back. So, I would have preferred that the ridges be more subdued than they were here, but still, they aren't as ridgy as we see in TNG, so overall not overly disappointed. Just think they should have been even more a bit smoother.
Also, it makes perfect sense that they'd wear helmets, I think the Klingons were pretty embarrassed at first when they lost their ridges, wearing helmets to cover this disgrace makes sense, so I liked the fact they were wearing helmets.