Ah heck. I thought this one was posted in Suggestions and I was trying to figure out what they were suggesting. Sounded like a suggestion to remove or totally change him, which I don't want.
I also think you haven't seen the true Astarion. You all judge so quickly on all these characters. The way I see him, and the little hints I've caught, he's messing with you all. He's making you think he's just some subservient, flamboyant victim.
I could be wrong, but it's only 20% of the game right now. I'm fairly certain Astarion, and all of them, have yet to show their true colors.
I don't know who are you referring to when saying "you all", and I am also not sure how your interpretation of Astarion is so different than anyone else's.
As for my interpretation, I would say he is a victim to some degree. But does it say anything meaningful about him or his actions? Dunno, but I doubt it. I see him as an evil guy that the only logical way one should deal with him is to kill on sight.