My highest-reviewed is Curtain Call with 1,172 reviews. It was helped by the fact that it's pretty long (90 chapters), although not Broken/BMS long. But a lot of people just really liked that story! It had a loyal following that left me reviews til the bitter end, and I guess that's how it racked up so many. I'm very grateful!
My lowest-reviewed is a tie between two of my one-shots, Adelaide and Seduction of Evil, which both have 2 reviews. Neither surprises me, since they're both old stories. Adelaide is original fiction, so I didn't see the fanfic crowd getting into that one, and Seduction of Evil is kind of like a bad R.L. Stine story, so again... not surprised. I think I only posted that one because I was one story away from having a nice round number next to my name on AC LOL.
My lowest-reviewed novel is Identical, with 5 reviews. I think the main reason that number is so low is that I posted the whole story at once back in 2005, several years after I wrote it, so it wasn't like I was ever updating it on AC. It's not my best work, either, but it's not a bad story. It got pretty good feedback on my site back in the day.