There was a list I found (spreadsheet) of which ones were good and which ones you should skip. It was written from the perspective of someone who was already faction-fit and in just about the best ship available for it, and was already near the cap for faction. The theory was that even losing standing for skipping the crappy ones didn't matter as the good ones had enough faction increases that it would keep you at or above your current standing.

I'll see if I can find it later tonight.