I mostly watch or listen to Angels games, and I can say that their radio announcers, Terry Smith and Rory Markus (I can barely tell them apart) are a total pleasure. They're smart, and have a biting, (but very subtle) dry wit which I really appreciate, and are unafraid to voice a critical opinion when warranted. They're a bit biased towards the Angels but not overly so (by contrast, Vin is the ultimate non-partisan). They're knowledgeable, and they know when to be quiet. I would say my only complaint, which is common among radio broadcasters, is that they get "excited" a little too easily, like deep but playable fly balls -- you get excited and the guy catches it.
On TV, their announcers are Steve Physioc and Rex Hudler, and for a while I found Steve fine and Rex insanely annoying. But since I've started watching other games in the Extra Innings package (or have heard other announcers during Angels games), I've come to appreciate Steve & Rex more -- I discovered that many local TV broadcasters make the game feel more like golf, their commentary and voices are so bland, inarticulate, and uninvigorating. So I don't know if I'd call Steve & Rex good, exactly, but I admit I now find them more entertaining that most, and now take Rex's cornball schtick more humorously than I used to be able to.