no, bro, just to take a look: tuyz got +7 on s0m at finals (the third highest diff) and stills with lower ACS than him. In other side he got 77% kast while s0m got only 71% even being the highest ACS on nrg...
ACS is the most meaningless stat, especially for controllers; KAST, Rating, KDR, ADR, APR, FDPR and Clutch % (in no particular order) are all miles ahead of ACS for gauging a controller's ability and impact.