I wouldn't go this far personally, though that's probably just my perspective on who she is replacing. After years of fighting crappy Blankas back in the SFIV days before they nerfed him to borderline uselessness, at least Laura is already a useless character. She's only annoying character-wise unlike Blanka who was completely unfun to fight and an annoying character.
Now F.A.N.G, on the other hand...
Actually, aside from Rashid, I don't really have much of an affinity for any of the new characters in V.
Laura is alright in my book, at least in Japanese. I don't like how overly sexualized she is though.
F.A.N.G. is a weird one. On the one hand, the character archetype is interesting and fits perfectly (he's basically slimy Gen). Plus he's got DBZ's Pilaf/Raditz's Japanese voice, so he can't be that bad. However, I hate his design. Way too goofy and cartoony, even for Street Fighter. What's with the comically thin face anyway?
My pick for absolute worst character in SF history, aside from a good chunk of SF3's character (sorry, I hate Necro, Urien, Alex, and Twelve, they either don't fit SF or are ugly/boring in my mind), is Rufus. God is Rufus ugly and annoying. I hope he never makes a comeback. Birdie is a much better "fat-but-strong" character, and even he has his flaws. I don't get his obsession with food. It's neither funny nor endearing to me. But I love the character otherwise.