[Wintermute]

Depends on the aggression of the opponent. If he's likely to be taking a stab at the pot with naked low or AA, then a call may be OK (maybe a raise if the guy is a real idiot). If the turn brings an uncoordinated high, then pot it and expect to take it down most of the time. If the turn is low, you have to check-fold.

If the opponent is rated as relatively conservative postflop, I'd probably just fold--but this is rare.