Bane is, was, and always will be a stupid villain. Was he ever written well? Nope. And how can you call the Rogues losers, lol? They are like most of the villains from the golden and silver age - cornball. They just stuck true to their roots and are my favorite antagonists in all of comicdom.
Toyman would make an awesome champ. Deathstroke would make for a cliche champ and bring nothing new to the table. But the power of television and what not... Deathstroke will probably be in the game way before the really interesting DC characters.