I didn't mind San Cristobel for the first year or two - I think where I started to get tired of it was when they wasted Tim Adams as Rob Layne, and for whatever reason, I really loathed the stuff the Labines did with Beth as Edmund's thrall (which wasted the genuine chemistry BC and DAM shared), Cassie losing her late term baby, etc.
I sort of felt like, at the time at least, that Wright did manage to play a slightly trashy character, in how she was styled (mainly her hair) and in how other people treated her. For instance there was always the sense that Josh saw her as unworthy. I imagine they did plan for a trashier character, what with the initial plan to have Zimmer play dual roles, and all the stripping, but as others mentioned I'm not sure how trashy anything would get on the bright white GL of the Rauch era.
I think at the time I was still so annoyed by the damage Dinah had inflicted on many of my favorite characters that I was happy to see her move into the bitch role, and I thought Moniz, who was such an unsympathetic and affected actress, suited the crazy bitch role very well.