Seeing as what they've done in the last few months, Ronnie would've been better off coming back last year than 2013. It wasn't hugely necessary to have her kill Carl White so soon after getting released from prison. The repeated breaks since her return have hurt continuity but the writing has been terrible this year. The Charlie/Roxy affair was the starting point. I reckon Charlie might have remained on EE had they kept him away from the Mitchells, instead pairing him with someone like Stacey (he's Dot's grandson and she was very close to her due to Bradley). Stacey would've approached Nick's return in a very different manner.
Samantha Womack is a capable actress but the writing for her this year has been shoddy. The lack of connection she has to Matthew, after so long of wanting to be a mum, is one of the worst examples of this. I don't care one bit for this affair with Vincent. Claudette is about the only remotely interesting part of the storyline.
It is just depressing that they're ruining what was one of the show's best characters. The last week is perhaps the first time I actually disliked the character. Which is a massive deal, as I've always liked her before this. This is in contrast to others like Ian or Sharon, who I often switch between liking and disliking depending on their behaviour.
Until the writing improves for Ronnie, I'm afraid that I'll find it much harder to sympathise with her. IMO Shabnam could replace her as EE's main tragic heroine.