Put it in any bucket you like, but don't ignore it. Mathematica is absolutely worth studying. If you've never used a general purpose term rewriting system before, you're missing out on some mind-altering stuff.
I'm not ignoring it, I used it years ago in grad school, it was fantastic. It just has no relevance (as a tool) to my current work or sideprojects. My question was strictly about calling it a lisp variant.
