It seems like every pitcher in baseball has fooled around with a cutter at some point. It's been the hot pitch to try in recent years if you're looking for something different to add to your repertoire.
Perhaps we can "blame" Mariano Rivera, who learned the pitch from John Wetteland and is headed to the Hall of Fame with it.
Some pitchers have success trying to pick up a cutter -- a pitch that is similar to a slider, but faster with less of a vertical break -- and some don't. Sometimes it's that one pitch that a hurler has been missing, and other times it's tough to get the feel of, so it's scrapped.