Berserker is a good adc, not the best in the west imo but definitely up there but the reason why his stats are this bad are pretty simple to explain: His teammates unfortunately suck.

Blaber is decent but constantly playing around topside and having Berserker mostly solo 2v2 with one of the worst supports in major regions without any ganks is certainly a way of how to run games. Blaber has to do this tho because Fudge is just bad and falls behind (unless he plays in LCS, he is fine there).

However, I would say that Berserker is also at fault for this in a way because he wants to play like this. He wants to play with Zven and if that stays for the future, Berserker will not get better because he can’t simply carry the game alone or together with Blaber if he is doing well. At this point I think Berserker is just content with how it’s going rn, tho he is still pretty young so I hope that perhaps he can go back to Korea and hone his craft more with actual decent teammates around him.