Another one that bugs me is "One Tin Soldier" by Coven. It just such a hit you over the head message. At least to me.
Anything by Styx. The lead singer's voice could cut cheese at fifty paces.
I'm going to go out on a limb here and nominate...
American Pie by Don McLean.
I hear that intro and I can't break the radio fast enough. Look. I don't mind long songs. One of my favorite dance remixes of Don't Leave Me This Way by Communards is 13 minutes long. It has four distinct sections. Another is the album version of the classic Autobahn by Kraftwerk. It clocks in at around 22 minutes but this is a symphonic suite, also having at least four different variations on the theme. American Pie has a verse and a chorus. That's. IT. For almost five minutes, there's very little variation in the tune. Verse, chorus, verse, chorus, verse, chorus, verse, chorus, repeat until dead. And the lyrics...are poo. I thought they were poo before I found out the story behind the song and I still think they're poo.
And don't get me started on Billy Joel's Piano Man. I'm having enough issues with my blood pressure tonight as it is. (HINT: WORSE THAN POO)