I personally don't mind thread resurrection, though sometimes I see one and I'm like "Whoa, where did
this come from?".
The only time it's a problem is if the thread had some offensive content in it and gets resurrected when it should have been locked. I know that the resurrector usually has no intention of continuing with the offensiveness, so I'd just split out the bad stuff and lock it.

EDIT: Oh, and another thing I dislike are resurrectors that add no real value to the conversation but just resurrect for the sake of resurrecting. I consider that as thread spamming. It hasn't happened yet, but their posts would probably be deleted and they'd get a warning.