That's fine. I'm not sure the show will have any legs for me. It's just that I went in expecting a dull, ugly titty show that we would shut off after five minutes so, so when it was actually kind of fun and had some effort put into it, my delight was heightened a millionfold. (Kind of like watching Mazinkaiser SKL, really.)
As far as I can tell the plot is probably going to be "Rio helps various people who come to the casino." That's okay for me; I don't mind episodic shows. I watched all of Okami-san because it was fun and pretty. As long as it stays on the same level of insanity I won't mind.
As for dressing Rio up... she's so well-drawn I can't even be offended by it. As an artist, it pleases me my eyes to see a woman drawn so well, in the same way it pleases me to watch a beautifully-directed robot fight. Especially when so many women in anime are constantly dressed up while also being drawn poorly, and being objectified far more than Rio was in far creepier ways.