I'm with you on that actually. I'm a huge (addict level) fan of Hearts of Iron 2 (i'm serious, it's like crack to me), but I took one look at the graphical style of EU3 and simply decided that I wasn't interested. Shallow and probably stupid, sure, but I know exactly where you're coming from.
As far as Sins go, I don't own it, and the reason I never picked it up was that, polished as it was, it felt incomplete. The limited trade and diplomacy aspects really took away from the touted '4X' side of the gameplay, which was a huge negative. If these expansions deliver I could easily pick this up.