Classic Arena at its current state (at least from a GOLD Tier perspective) is perfect for myself
The odd easy fight if I cycle thru my free refresh enough and good match ups
The test I do to check arena is as follows
use your 10 daily tokens to run the whole bracket from top to bottom 1 token per fight. at bottom of the bracket how many of the 10 fights did you win?
If you won more than you lost then the game is doing a good job at selecting you competitors. Often I find myself winning matches even I did not think I could of won
Mostly because a enemy team has a cranked up Power number twice as much as mine (but come to find out its mostly resistance) , which in the end I win anyway
So before you condem clasic arena go do this test and report back how many of the 10 match ups you won or lost ? I certainly would be curious to find out and you may be surprised at how many you win that you thought you would not
at the end of the day it cost you nothing to do (except time), and upgrading the Great Hall is too valuable to everyones account to pass on