I had a some what simialer experience. I had never rode Magnum before, until this year. I went on a trip to CP and rode MF, and thought it was the best coaster ever. Then I made my way to the back of the park, and then towards Magnum. I was always scared to ride magnum before. Then I told myself that if I can go 300', then I can do 200'. So I rode Magnum, and felt that it somewhat boring, it just didn't give that much of a rush.
Then on a later trip I rode all my favorite coasters, Raptor, Mantis, every coaster at CP. I felt that all of the coasters were just as good as before MF.
So what I'm really trying to say is, Don't get on every caoster after MF and compare it to MF, just have fun.