Do I think maybe they've made too many throw-away species? Yes.
But I also think that the later Treks should have made 80% of background extras in some sort of alien make-up in order to stop giving the "human-centric universe" appearance.
No reason all the walk-on folks had to be human. OK so making up too many Bolians and Klingons would be a problem, but they could have quadroupled the ratio of bajorans, trills, Vulcans, et cetera. You know?