I urge them NOT to listen to player feedback regarding balance!
I urge them to use facts and proper testing. These facts and testing can come from the community, but lets face it, the vast majority of feedback is ridiculously biased and it is usually wrong. The devs need to balance classes based on their maximum potential, not average player skill.
Whether you look at maximum potential or average skill (which is a funny thought when it comes to Lolsmash), there is still a giant inequity.
While I agree with you that proper testing needs to be done, kills to death ratios isn't it. And it hasn't helped them properly test the balance for the past many months that there have been issues.