Moyes felt Old Trafford was a perfect fit for him after 11 years at Everton when he got the chance to follow Ferguson.
He told the Mirror: “I would have loved to have done much better. It was a great opportunity and a job I felt I fitted.
“I am more disappointed with myself that I didn't make it work. I believe I am much better than what I showed. I had to do better. There were mitigating circumstances. When you look at it now, what Sir Alex got from the squad to win the league is remarkable.
“What I didn't get was time.
“Do I believe United would be in the Champions League now? Yeah I do, if I had been in charge.
“Do I believe we would have a much more stable club? Yeah, I do. I have also got to admit in the short time I was there, I had to win more games."