Currently arena have an issue - too many alts and smurfs.
When some good player, who have main in top 10 start to farm arena with his other chars for season rewads (Hongmoon Coins).
Problems with that:
1 - There is no normal skill curve in arena, from 1300~1500 you get normal skill curve. But, when you get on rank 1500+, your opponents are random.
From 1450 new player, then equel to your skill opponent and some no real life dude who already have 4~6 alts in 1800+, and clearly you have big disadvantage.
2 - Alts and smurfs steal your act