I dug the prologue in the newest Star Trek movie. Though I have a feeling now that I own it on dvd, I'll usually skip straight to the action when I watch it.
When I took my fantasy/sci-fi novel in to be reviewed by my last writing class, that was the biggest question my professor had for me. Why do you need this prologue? As was mentioned before, if it's just a big info dump, then you're probably not doing your job as a writer (i.e. show don't tell, competent world building, etc). I don't mind prologues in general, but ever since that class I often find them unnecessary.