I really like prologues. Personally, I don't find them confusing as long as they're done well. Emphasis on the last word.
How do I know what "done well" means? It's hard to say. For me, the prologue tells a very short amount of backstory before your story actually begins. It clues the reader in on something that will or has happened throughout the course of the story. Perhaps it tells your readers something that happened in your MC's past, or explains a component of your story that wouldn't otherwise fit in.
If you haven't checked out Pub Rants, you're missing out on a super helpful blog on publishing, writing, and just about anything related to the publishing world. The blog author, Kristin, chimed in with her two cents on prologues. Here's a hint: she's not a fan.
I also drink the Bransford Kool-aid and will stare at you quizzically if you tell me that you're a writer and you've never A) heard of Nathan Bransford, or B) checked out his website.
Nathan chimed in a few years ago on the prologue debate and it still bubbles up on the forum. Nathan's argument is simple. If you can remove the prologue and the story doesn't change, you don't need it.
While I know that Nathan is kinda the Yoda of all things publishing, I just can't break away from my prologues. I use it to set the (usually ominous) scene. In an effort to be very honest about my own skill level though, I think the fact that I rely on a prologue tells me I have room to improve my craft. I shouldn't rely on the prologue to make my reader think, "Oh! This sounds interesting."
No, I have to do that by myself. Just not right now. I finally have a decent prologue on my hands.
Do you care if the story you're reading has a prologue? Would you be willing to include one in your story?