the reason legends of the dark knight started sucking is because legends of the dark knight started sucking. robin was a casualty as much as batman. the dark knight returns and the morrison batman and robin are two examples of how robin is a great addition. its the story, not the character.
i prefer a loner batman as well, but throwing in some bonus content and an (optional!) playable robin doesn't, at all, on paper, take away from the game. now, maybe robin will be terrible, and the game will be terrible, and aw hole buncha other stuff will be terrible. only prometheus can know for sure.
but if the game is anything like the first, and robin's role is exactly as described in the only piece of information we have on his role then there's no reason to think anything will be a detractor, let alone "suck"
