I see it's somewhat of a mixed bag...
The Glazers have been the owners of my team (American football - NFL) for a dozen years or so. While it's true that since they took over the cost of tickets to the games have skyrocketed, the same thing is also true for other league teams. But in our case, our team improved tremendously during that time. The Glazers brought in a new coach, one with years of league experience but never as head coach, and the new coach changed eveything. They drafted brilliantly, brought in a choice veteran here and there, and built a team that was among the league's best for a decade. After four or five years flirting with ultimate success, they brought in a new coach who put us over the top and we got our first Superbowl victory.
If the Glazer's performance with the Tampa Bay Buccaneers is any indication (and I believe it is), after a few more years with them in charge at Man U most of you fans will be quite pleased.