The 9th is one of the 5 best symphonies ever written (and for some musicologists, the best of all), and since my point of view, one should not say that the 9th is overrated just because is not able to appreciate it.
Rcprince, be patient with this symphony as you were with Mahler's music, if you liked the 7th I'm almost sure you'll love the 9th after a while.
Eldartford, would it make sense to you if I said Mozart's last 5 symphonies are overrated? I guess you would laugh.