While I posted the feedback above to the forum, another good event took place in Korea.
Mr.Robin, our Twich broadcaster, one of the official SEGA partner for DOW3 broadcasting, was able to send our feedback to SEGA Korea.
They actually welcomed the feedback and promised to make it reach Relic Dev team.
I don't know how would this turn out, but thanks for all those kind comments and additional ideas that we were not able to catch it out initially.
(such as Spectre DPS, Diminishing Eldar powers during late game, KillaKan spam issue)
Hope the DOW3 rise from ashes like Rainbow Six: Seige, which also had bad reputations at early stage of service, but was able to recover from it due to its dynamic feedback between the users and Devs.