There's no question that Jack could have been treated better, but that's more to do with the nature of the industry back then than anything else. The guys that owned Marvel didn't value Jack as highly as Stan, but given how Stan has spoken loudly and often about how much of a contribution Jack, Steve and others made in those early days, I don't see how this can be blamed on Stan. 

Well, The Comics Journal will probably publish a negative contrarian obituary but that's about it.  

But, as an employee, he was also a "company man". "Company men often get corporate rewards that freelancers don't get.

Had Kirby accepted a full-time position and also become a "company man", he might have gotten a bigger cut in the long run. There was a point where Stan was paid a million a year for a while just for being "Stan".

That being said, I dunno if there could have been a "Stan" and a "Jack" at Marvel at the same time: even the Beatles split up.

And I hope Stan is remembered for his skills and for being a nice, likeable guy, who just happened to play the corporate political game better than Kirby or Ditko but who nevertheless had a genuine artistic voice and vision that was unique -- and helped keep the comic book industry going a few decades longer than it would normally have.