Well, in fact it's not all her design in terms of ready-to-wear, but Yvan Mispaleare, who was once doing his own line as well as being head of Phoebe Philo's team at Chloe when he closed down his own business.
It's not particularly bad clothing, it's just an entirely different aesthetic than the one Tom Ford has had (and that Alessandra Facchinetti probably executed in terms of clothing). It's probably not a lot different from Hedi Slimane being succeeded by Kris Van Assche, since both designers actually founded a ready to wear identity for the houses they designed for, as neither Gucci nor Dior had a 'heritage' to draw from.
Gucci is somewhat of a dirty job since it was evident that the ready to wear sector was not a priority when they eventually kicked out Alessandra Facchinetti and John Ray to not risk losing Frida Giannini, who's accessories collections were turning a lot more profits for the house than the sales of RTW. The average customer at Gucci is probably not one that is an educated fashion follower... It probably hasn't even been when Tom Ford was around... it's the kind of average or badly dressed tourists, mostly of Near Eastern or Asian origin, that are accessorizing their Gap and Banana Republic gear (or worse) with a mid-prized, logo-canvas bag or wallet. These customers couldn't care less what's eventually been shown on the catwalk, and therefor I believe that the brand is still benefiting from the fashion-forward reputation that Tom Ford helped to establish for the house.