I was thinking a bit about this the other day. CT Russell, from what I remember about him, kinda seemed like a genuine, nice(ish) guy, although he had a few eccentric but harmless ideas.
During the Russell era JWs (actually Bible Students) could still celebrate Christmas, worship in other churches if there was no Kingdom Hall available, and accept blood transfusions.
Then after Russell died, along came Rutherford - a major league a-hole, for sure.
Rutherford had plenty of eccentric ideas but at least some of them weren't/aren't harmless.
Some have been long forgotten about - Jesus depicted without a beard, the plan to rename the names of the week because names such as Thursday (Thor's day) is pagan, the articles about the 'dangers' of aluminium, etc.
One key contribution of Rutherford which does a lot of harm is no blood transfusions, even in life-threatening situations.
Another is shunning, something which never occurred under Russell, or at least was much milder.
Rutherford has a lot to answer for, I reckon ...