All the mud being slung at Terry Farrell strikes a weird chord for me. Her acting never bothered me.
The characters played by people with real acting chops, IMO, were Odo, Quark and O'Brien. Garek too in a super hammy one-note kind of way.
Frankly I found myself being far more distracted by bad acting flaws from Brooks, Visitor and Siddig far more often. Sisko was fine for me when he could play the too-cool-for-school brooding thing (which he did 90% of the time) — but as soon as he had to emote, oy! I never once bought the Kira is a badass bit that was continually shoveled down our throats — no matter what, Visitor just never could convince me. And the hands-down worst acting on the show for me was Alex Siddig.
When I hear stories of other actors giving Farrell a rough time and a cold shoulder, I sure hope it wasn't coming from cast members who had their own noticeable shortcomings in the acting department.
Farrell talking about her flaws and insecurities is astonishingly refreshing. If she thought she needed a coach, it's a sign that she wanted to be better. I applaud the sentiment. Very un-Hollywood and down-to-earth.