For the pittance you can get DA2 for these days, it's worth it. However, Origins is a better game and if the choice was between the two, I'd take Origins in a heartbeat.
To be fair, I'll say I like the combat in DA2 better, and I think it handled leveling/abilities better too. But I thought the best thing about Origins was the scope of the story, an epic scope that is completely missing from DA2. The characters are much better, though I think since Hawke has a voice, s/he's a more compelling protagonist than the Warden.
Origins is better and if you want an RPG that harkens back to the CRPGs of the late 90's, then play Origins. There are a few instances where the impact of your choices in Origins are shown in DA2, but it's never significant (some characters show up who might otherwise be dead, or people hail a different person as king, that sort of thing).
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