Define enjoyable? For some a good tough battle is enjoyable, you get a really good idea of what the creator of the defence team had in mind when you battle them, for others enjoyable is not losing a battle,for others it's got to be a win and over in a minute anything longer is a waste of their time.
I've seen a lot of the original champs write similar things in the forums "arena is not enjoyable any more, I'd rather play Gauntlet etc, certainly this week alone I am amazed by the number of new names Im seeing at the higher end of arena, and a little disappointed there aren't a few more originals still showing how it's done, each to his own I guess.