Yes to the MW if more people would fly in there. The only times I'm not in the MW arena is when total population falls under 30 and there aren't any fights to be found, then I will enter one of the LW arenas.
As for the AvA, not really interested in any of the scenerio matchups they usually do unless it's one with the P-38 as part of the plane set. In those cases I'll fly in that arena.
ack-ack