I like Buck's personality and I find him to be genuinely funny, so he's a good colour guy imo. His insights as a player are often pretty good. The problem is that Tabler just encourages Buck to say stupid s*** on top of Buck just lacking the flow and voice for good pbp. When Shulman is there to kind of neuter Tablet's utter retardation, you see big improvement from Buck.
As far as Howarth goes, I found his voice grating and he came across as rather dull imo. I exaggerated, he wasn't terrible but he wasn't very good.