The Return of Gus Pike wasn't good for his character
Don't get me wrong I love that episode,, especially the flashbacks. I also love the scene where Gus reunites with his mother who had long believed was dead. However, now that I think about it, I wish it hadn't happened because it takes away part of what made Gus such a great character in the first place.
For most of the series run, Gus had no real family, just a horrible father who was in and out of jail. The legacy of Abe Pike always haunted him as he worried that he would become like him. Several RTA sites have referred to Abe Pike as the show's most hated bad guy and that's completely understandable. He wasn't just some guy who showed up, wrecked havoc and then left. He was the father of one of the show's most beloved characters!
All of that stuff was awful for Gus but great for his character. It gave him a tragic quality that was very appealing, especially when he bonded with the King family.
Therefore, I was disappointed when Gus found out his mother was alive and that Abe may not be his father after all. Gus with a mother and a good father is a lot less interesting than Gus with no family besides a murdererous father.