I just find Tobi and Rach boring.
The rest are a trainwreck that I love to watch.
As for Tobi's criminal past, I think it's one thing for someone to be legitimately charged with something, cop it on the chin, learn and grow from it, and another to keep repeating the behaviour and crimes over again. I think it isn't fair to tar someone with a brush for something they did 10 years ago.
My sister was done for low level drug dealing when she was 18. 15 years later, she's done so much work on her self, has gone to uni as a mature age student and now works rehabilitating people in incarceration. Imagine if all of that work was dismissed because for a few years of her young adult life she was absolutely the worst? I think there is room to acknowledge someone's crimes and their growth (if they've had any), but to me it's a bridge too far to talk about their crimes as if they were charged yesterday.