Not even close... You forget the most important thing, Astarion is evil. None of these characters are evil. He has something in common with Lestat, they are both drama queens and so selfish. But Astarion is still better, at least for now. Lestat regretted his actions, worried, burned in the sun and sobbed bloody tears. Astarion? He enjoys it, that's why I love him.
Now that I've brought up "Interview with the Vampire" (oops!) I should probably add that we can't compare Lestat and Astarion - YET. Lestat's story is complete from the books, and Astarion's is not. We have only had a small taste of it. (Also Lestat's author had a big religious epiphany in the middle of writing her books, which probably skewed the character a lot. I don't remember, I stopped reading the series when then religious stuff got too annoying for me.)
Right now, I get the feeling Astarion is most interested in survival, and right now our team is his best opportunity to stay alive and enjoy life/freedom as much as he can, in his own way. If you do play Evil, he will quickly become your most Evil character in the team. But if you play Good, he will still approve as long he sees some of those chaotic, survivalist, fun-loving tendencies in you and how you speak with him.
BUT - his story is far from complete! What is really written on his back? Who will he become after we deal with Cazador? Will he be able to resist his old master? Will he become a full vampire and turn evil in this personal quest - or if we kill Cazador, and will Astarion be able to find closure in this after 200 years of abuse, and figure out where his life goes from there? Will he still be with us until the end of the game, and who will he become? I really can't wait for more of his story!!!
Also, he does have some humanising moments, they're few and far between (and one is not actually in the game yet) but they do exist...
One is when you speak to the mirror guarding the room with the Necromancy of Thay tome. When the mirror asks "what would you like to see?" one of Astarion's dialogue options is "I'd like to see my real home, the one I haven't seen in hundreds of years". That is really sweet. The way he basks in the morning sun after your night with him is also great to see. Also, there is an unfinished, unreleased scene that you can watch on youtube, where he looks at a mirror and laments what he has lost. He doesn't even remember what colour eyes he had in life. When you offer to "be his mirror" it quickly turns into flirting and teasing about "shallow praise" for his appearance, but it's moments like this that make me think there is some humanity left in him, well-hidden after years of abuse. I do hope we will see more of this side of him.
