I haven't played the first 2 either but still got charmed even going into the game as a full blown dragon age fan girl. But I don't think I'll play the first 2 as charmed as I am with the 3rd. Well .. maybe the 2nd maybe. I've got the games just to give support ( and they were cheap on steam) but I don't think I will touch them.
I really envy tommyservo's patience on the series marathon.
I'm flattered and still exhausted.
TW2 was really good. You should play it. I think comparisons to DA2 are about as relevant as comparisons of TW3 to DAI (which is to say, not very, for pretty much all the same reasons). The political minutiae was engaging, some of the characters were great (I really, really liked Saskia and Iorveth, and I liked Letho as a villain), and the divergent second act was really cool. If you've got it, I'd definitely give it a go. You'll probably miss beard Geralt a lot, though.
TW1 still has nearly nothing to recommend it, in my view. The writing is stilted and awkward, the acting is almost universally terrible, the story is pretty static and predictable, and the gameplay is an awkward garbage clickfest. It's also ugly and bland. If you were to play it, I'd suggest cheat mods, which is what I resorted to by the end of act 2.
The music was really pretty though, so there's that.