Let's be real, new players don't know squat about building champions. And that's cool, we've all been there. But they are all hell-bent on competing in arena - the most competitive content in the game.

Armed with an unascended farmer with a whole of 33% crit rate, and lvl40 Shaman, they can't beat UDK because, obviously, UDK is an OP S-Tier God Mode Beast of a champ......and they would know, right? I mean they are about to get Jizoh, ffs....they're practically veterans. If it weren't for UDK, they'd be owning Plat right now. 

I don't know at what level the Arena becomes available now, but they need to push it way back....and I mean WAAAAAY back. And get rid of all the early arena missions. Don't make it available until you're at the stage where you have to know how to build a team. Maybe have beating Dragon 15 open up Arena or something. 

This stream of hyper-opinionated players who haven't gotten Khatun yet are not ready for Arena. I haven't seen a single dedicated nuker build for arena and I haven't seen a single arena team from them (which can be made entirely out of farmable champs, btw).