No, Brooks is not a good actor, because his acting becomes vastly unbelievable whenever has has to get emotional, i.e. his flip-out scene in FBTS.
Ah, here is Combs talking about the scene I just cited:
Jeffrey Combs said of Brooks in "Far Beyond the Stars": "Avery was spectacular. There was a scene toward the end where he falls apart with the camera right in front of his nose. It was just riveting."
I love Combs (Combs himself is a far better actor than Brooks, and most of the rest of the main DS9 cast), but Combs is dead wrong about what he said there. That scene should
be riveting, but instead, Brooks' terrible acting makes it laughable.