I'm mixed. I picked Ashley in ME1, because Liara just seemed too...off. In ME2, Tali was just the right combination of geeky, confident (within her realm), snarky and sweet. She reminded me of Willow from Buffy. But...when I played the Liara expansion, Liara was *far* more interesting to me then she was a game before. She grew up.
And yet, I still prefer Tali.
So far, none of the DA2 interests really speak to me...Merrill doesn't quite have the Tali quirks down pat. Isabella, though, is *hilareous*, so she has that going for her.