In my opinion for the interviews with Fearne, I don't think she was that bad in terms of the accent and her answers....But on the other hand, that fact that she made Fearne wait for numerous occassions was unprofessional.
Though I do feel sorry for Mischa sometimes. I remember when she was the "it girl" during he OC days, and it would definately have been overwhelming to get the rave from the audience when she started at only 16....But it is weird of her british accent during her interview when her accent was so american in the OC..