The problem with any "United" song that they play it's some cheesy recording which started way back in 98/99 when Keith Fane got some crowd together to sanitise all the fans songs. That god awful version of Ole's you are my sunshine was the pits. Since then, they've sort of latched onto anything that catches on. It what makes them playing GGMU bad, they could have at least kept the 85 cup final teams version instead of that.
As for entrance music, I don't mind if they mix it up between the Rocky and Roses to be honest, I always feel that the Rocky intro is best when the crowd is a bit flat, it gets everyone going, where as if the crowd is pumped the Roses one works really well.