Jacqui certainly isn't bottom of the tier list, at least not in Full Auto, She has great damage, good mix ups, good zoning, also has pretty good strings as well. 1212 all being 0 on block create some nasty mix ups. Only thing she suffers from is T-rex arms syndrome. Bottom of the tier list? I don't think so. Mid tier sure.
Tools, strings, damage etc etc, I know. But it about match ups, and I feel she loses to more characters than she wins against, and even though she CAN win against anyone in the cast, she is most likely disadvantaged in most of those match ups.
Look at Reptile, he has good pokes, strings, tools and so on, but he has up hill battles and no real dirt, so he might have a bunch of 6-4's and maybe a 7-3 somewhere, and even though he can win in those match ups, most of them are never on his advantage or at no point can you say, that he ruins anyway, except for maybe Kung Kin in Bojitsu only.