I really like V9, I think it's one of the strongest volumes of the show.
I personally thought the smaller cast was to V9's strength, a problem RWBY's had is that it's tried to have a shonen style large cast but has never had the run time to balance all the characters. This is also why I really like V4.
You're right about the budget constraints, they preemptively cut this volume's budget so V8 could be longer (V8 and V9 were greenlight together), which I think was the right move. This volume didn't need all the fight scenes like V8 did, but the final episode of our main cast reuniting with everyone in Vacuo getting pushed to a potentially never-to-exist Volume 10 was a let down.
Ruby having the mental breakdown she's been putting off since V3 was very satisfying (ok, that sounds bad but you know what I mean).
Context for people who don't keep up with Lemmy drama.