Yeah, sometimes it's tough to separate the work from the person. Some awful people have created great things. Roddenbury deserves full credit for kicking off Star Trek and establishing the basic world in which it functioned.
After that? IMO, All things Star Trek would have been better if he'd voluntarily walked away from it soon after birthing it but, hey, he had a profitable (for several definitions of the word) franchise on his hands so he rode it way too hard for way too long.
Agreed with everything. And let's not forget that grade A bitch Lucille Ball deserves mega credit for not letting Star Trek die as a pilot episode.