I have mixed feelings about Gary. On one hand, it must be very tough being married to Lucille especially when he knew that Lucille had always loved Desi and he was irreplaceable. The world disliked him because he was a replacement. In America's mind, Desi and Lucy were meant to be together.
Moreover, their children have emphasized so much that Gary was a wonderful man and he had helped maintain family harmony.
On the other hand, I've read many comments from Lucy's relatives and closest friends. They all said two things, that firstly, Gary had separated Lucy from her relatives and friends and became very lonely at old age. Secondly, Gary had offered Lucille very terrible business advice, and the postulation was that Gary wanted to make more profits.
With such extreme viewpoints, I really don't know what to think of. I just hope that Lucille was happy being married to Gary.