But, that can't simply be it. It would be completely unfair to certain classes if there was just a one on one arena. (e.g. warriors)
I propose that the solo arena groups characters by class. There, warriors can fight other wars, mesmers other mesmers and so on.
I also propose another feature, maybe taking place in the same arena, that is similar to a 'duel'. There are sooo many people on this game talking crap that their character could beat ANYONE elses. I think it would be fun if they could challenge each other, despite which class they are, and fight it out.
I think that calls for a certain mark on the PC that would show that they lost a said duel and something that the winner could keep and show off. (similar to the Diablo ear thing.)
I would love to see it- some warrior talking a bunch about how his character is the best solo character, then coming back with half an ear.

-CM