Firstly, I'd like to adresse this by saying that softcounter and HARDcounters do exist in arena, with some matchups being as bad as 8-2 at times. "Skill" can only do so much, as you'd need to massively outskill hardcounters to win a match off them.
Second, "keep improving yourself" isn't really a remark you'd say to a veteran and skilled player who has not only clearly seen the up and down of this expansion in term of high level PvP.
Lastly, whether rank 1 was taken by a different comp than Warr in 3s is irrelevant, as 3s is a completely different bracket than 2s, with problems of it's own. The fact 70% of the 2v2 ladder is dominated by Warr/Hpala is a clear sign of the comp's dominant nature in that bracket. Hell, even in 3s Warrior is STILL a very, absurdly powerful class.
Anyone who isn't biased and has played at high level will admit that Warrior is an overtuned class.