So naturally, she's the primary antagonist (or at least, was until now; word has it they've got bigger issues now).
Not that I care; Parilla shines as Regina the Evil Queen. Her acting is flawless, though I prefer when she plays her Storybrooke counterpart, rather than the Evil Queen. She looks better, and the venom flows all the more convincingly.
She caught my attention from her very first scene and held it until the end of the first season (for some reason, I'm having trouble caring about the second season. I don't know what it is). When I say her look is flawless (in Storybrooke), I mean it's flawless.
The wardrobe don't translate so well over into the fairy tale world. Not that it's bad, it's just Parilla looks better in contemporary clothes.
While I adore what Parilla has done with the role, the characterization leaves much to be desired. Her thirst for revenge is understandable, but the actual reason for it falls flat on its face. Ordering an enslaved huntsman to her bedchamber came off really sick and tacky. I've been meaning to watch the second season, if only to see what happened with her.
...And I await the return of Sinqua Walls as Lancelot.