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I've spent time there (including in the DMZ) doing research on the topic and I've seen the Org Charts. Nobody I know underestimates the NK forces. Their capabilities and numbers are well know. Their deficiencies are also well known. The conventional wisdom in both US and ROK military circles is that the first 48 hours would be all NK but that would be it. This is of course talking about conventional warfare. If NK goes nuclear with a first strike it wouldn't matter whether we are there or not anyway.
Thats about my assesment...the first few days would be a tactical retreat to buy time.
I've studied the situation too...although I haven't been over there, I'm sure that will change...I'm active AF.