I'd say that Briggs could be occassionally good, as I thought he was with Old Sixie's regeneration story. Mainly, because that was a very plot-driven story, but was also able to put some emotion and character throughout, which he often forgets to do (not unlike OldWho, I might add). I just think, more often than not, he sacrifices plot for those emotive, characterization-thriving moments, which is exactly what I expect from BF.