Not sure how your match making system works in arena, but seems regardless of what tier arena it is, I'm up against players 10 - 15 levels above my level. You should have it level limited, for example 30 - 39 regardless of what tier you are. This way it will keep it reasonably fair for the lower players as they will eventually come against players closer to their levels.
Also whilst battling the other players it appears there is no cost factor being taken into account on the opponents side. Watching multiple troops being dropped one after the other even when they are expensive, only to see the boss being deployed, Then to see the tower ability being used immediately on its cool down.
Certainly creates a struggle to gain a spot on the ladder specially if your against an opponent 10 levels above you