I didn't hate Lauren because of her interference between S/V. I hated her because she was boring and truly served no purpose. And actually Lauren was consistent until they decided to make her evil. That's when her inconsistency started. So yes, MG was not responsible for writing inconsistency, which did not help her performance. But what is her excuse for the first half of S3 when her character was consistent and her acting was still terrible? Now who knows, maybe this is a simple case of MG simply not being right for the part. Maybe MG could play cute. Maybe she could play bubbley. Tragically she couldn't play smart. Or any complex human emotion for that matter, something the role of Lauren would have required. And she had no chemistry with MV or any of the cast whatsoever.
Turning Lauren evil was a cop out, plain and simple. The writers struggled for the first half of S3 to make us like Lauren. Instead of putting some effort into it like giving Lauren a sense of humor, some intelligence, some compassion, or giving us any redeemable qualties, they made her into an ice queen. She never laughed, never showed any compassion for Syd or her husband (who she was supposed to love), or demonstrated any ability to be able to perform her job compentently. I know that I was not the only one who wondered why Vaughn fell for Lauren. So when the writers realized we were not going to love Lauren as the frigid ice queen they made her evil instead.
And Lauren was a terrible villian as well. Need an example of this? See the ep where after Lauren kills the goth guy at the club. Now if I had just shot murdered somebody in a crowded area, I would hightail my ass out of there. But not Lauren. She goes outside the club, calls Sark, and proceeds to tell Sark in a voice so high pitched only dogs could truly understand her what has occured. For some reason, I don't think jumping up and down, drawing attention to yourself is the wisest course of action. But maybe that is just me. There are many other examples but this post is long enough and I would bore you after awhile.
The truly sad thing is, Lauren had great potential. Had she been executed properly perhaps the character would have worked. It's amazing what some great writing and even better acting can do. Sadly she wasn't and we had to live with the consequences.
The only good thing I can see coming from her returning is if Vaughn somehow recovers from his Lauren issues due to her return. How this could work, I have no idea. But at least then the return would have some purpose.
End of rant. Continue with your day.