Yeah, I never said Robin should be in the bat-sequels. I'd be just as happy not to see him.
BUT --
I don't dislike the character, nor do I think it's as absurd as some here make it out to be. If Robin were about 13 and full of anger, and was going to go looking for revenge no matter what - the only way Batman could protect him is to train him.
THEN I could see it working.
Also, with martial arts - believe it or not - a kid CAN kick an adult's ass.
It's physically possible.
I think if they did Robin, they should do it as a controlled story arc - have Robin start out as young kid who needs guidance lest he get himself killed in his quest for vengeance - Batman takes him under his wing and the dynamic is sort of Ra's and Bruce from "Begins," then over the next film or two, the missions serve double-duty as training for Robin, until he is able to take down the person who orphaned him.
In the course of that adventure, Batman and Robin have a falling out and Robin leaves. He's gone for a couple movies and comes back as Nightwing for a guest-shot in a film, and then his arc is done.
Of course, it'll never happen.
But the point I'm trying to make is that Robin COULD be done well. Just because he hasn't been done well yet doesn't mean it isn't possible. It just means people haven't done it yet.