I heard about this a while back, and was torn between excitement and pure dread. It is one of my favorite books just because of the characters, not the plot, so trying to see it being adapted on the screen has been very difficult.
This kid played Percy Jackson. I really wish they had cast an unknown for Charlie. I don't think people know this kid's name, but they'll recognize his face. Same with Emma Watson, though I have more credibility for her than I do for this Logan guy, probably because I'm such a Potter geek. But he's not at all who I pictured Charlie to be. If Emma is playing Sam, I can see her fitting well. But Charlie is supposed to be and look much younger than Sam and Patrick, or at least that's how I always picture him to be.
I will see this, but I know I will be disappointed. I know Chbosky wrote the screenplay, but that doesn't mean it's going to measure up to the book in any way.
I know exactly what you are saying. You're not worried about the plot, just more how the actors are going to handle their roles. That is my only fear as well. I hope Logan does a good job. I have faith in Emma Watson and I'm also curious to see how she acts outside of the Potter films. The only time I've seen Logan is in The Butterfly Effect and he was pretty young in it so it's hard to tell if he'll be good as Charlie. He's got quite a complex character to play, hopefully he delivers.