I agree. I wished that they would make an episode of anime with him. They did with Pokemon Ranger why not Colosseum and XD:GoD? I hope that there will be a sequel containing him.
I think Genius Sonority kinda recognised how awesome Miror B was tbh. Explains why he's better animated than most other characters and gets so much screen time too. But well, what's not to like about a man with a giant pokeball-themed afro with an army of dancing pineapple ducks and the best music themes in the series? =p
I think that's what most people did tbh. XD Same with XD:GoD as well - although if anything the game rewarded you for missing shadow Pokemon by making you battle him. XD