I make it a general rule not to just draft someone on a lark without having a good reason.
I use my gut for two things. A tiebreaker, which I think all of us do. The 2nd is to prompt some research. Sometimes I'll be thinking about fantasy football and my gut will make me think something like "I bet running QBs hold their value better from year to year than immobile QBs".
Recently my gut has been telling me that tall running backs are more injury prone than shorter ones. Probably silly, but Fred Taylor is 6-1 and Robert Smith is 6-2 and both got off to an injury plagued start of their career. A warning for you McAllister (6-1) and Ahman (6-0) owners out there.