I often find Judy Blumberg's commentary very informative in ice dance, particularly when she gets into the more technical minutiae of ice dance that most commentators skim over. Blumberg's background as an ISU tech specialist definitely helps here.
Terry Gannon may not have the strongest skating background (esp. when it comes to tech), but it's kind of heartwarming when his love for the sport shines through in his commentary when he gets excited.
I think Tracy Wilson is generally OK but she's definitely had her moments of extreme bias (cough, Nagano ice dance, cough).
I also thought Josee Chouinard was hilarious when she commentated at Canadian Nationals a few years back

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