My least liked songs are:
God Part II
The Wanderer <--But I admit that I loved when Bono sang it in Nashville. After I recovered from the shock of him breaking into it. Truthfully, if he'd sang the song on Zooropa, I'd probably have liked it. Not a huge Johnny Cash fan.
I used to dislike Mofo. But I've changed my mind because on live versions (bootlegs, DVD), it absolutely kicks a$$. So that made me listen to the studio version and tolerate it enough to no longer dislike it.
Everything else I generally like and if it's not a favorite, I dont have a horrible "need to skip" dislike of it.