I think any unbiased and in-depth study of Rutherford would have to show the warts. His alcohol consumption was apparently the stuff of legend (possibly, or at least partly, in a literal sense). The failed prediction of 1925 would have to be prominent, not only because it was such a clearly-stated prediction, but because it led to a staggering decrease in followers that took a long time to recover from.
The building of Beth Sarim in San Diego is linked to the 1925 debacle. And it is all the more galling to learn that the only use the opulent residence got during its WTS owndership was as Rutherford's second -and then primary- home until his death. The extravagance of having two expensive luxury cars during a crushing economic depression should be an embarrassment to the WTS.
And there's more. The way he maneuvered the WTS to claim the presidency in direct opposition to Russell's will. The letter to the Nazi government, where he offered up his integrity in the hopes of getting favorable treatment for German JWs, later telling a very different story about it. The real reason that he and his co-conspirators got out of prison early (agreeing to remove certain pages in one of his books to appease the US government). The "millions now living will never die" campaign and speech.
Honestly, he is a dream subject for any documentarian. You could do a multi-part video covering hours, just dealing with all of the controversial or scandalous stuff. I think it hasn't happened because JWs just don't seem to have that sort of prominence in people's eyes, the way Scientology does, for example. If the organization's profile rose high enough, I guess it could happen.