Is it good or bad that the rest of my team is working on the large (shoddilly built) apps but I'm on the side building analytics, reporting, and other tools? (basically telling people why there are so many problems with their app).

I think it's good. Understanding analytics is a great skill to develop.

Everyone thinks they can do analytics but there is a hell of a lot more to it when you really get into it. It's a great thing for your cv (if you can do it well and really understand how to get value out of it)