So time to play the game:
Beethoven: Symphony No. 9. I do enjoy it from time to time, but most recordings lose me with an interminably dull 3rd movement, and one has to be in a particular mood to tolerate the Finale.
Emperor Concerto. I used to love this thing. But I enjoy the first 3 piano concerto so much more.
Tchaikovsky: Symphony No. 4. Loud and obnoxious.
I'll admit that I used to enjoy the Elgar symphonies more than I do these days.
I'm usually careful about "husbanding" my exposure to the big warhorses, but I think I did manage to wear out the Ravel-Mussorgsky Pictures.
But not enjoy Dvorak's Symphony No. 9? Never! Always thrilling in the right hands (try Lenny on Sony, for example.)
I'm leaving out a lot of big, important sacred Baroque things, big Victorian choral things, and a lot of opera, just because I'm simply unwilling to put the time in, usually, and it seems unfair to blame the music.