My picks for a general bottom 5: Beware the Forest Mushrooms Forest Interlude Happiness of Marionette At the Frozen Depths of the Heart EXEC_REBIRTHIA=PROTOCOL/.
None of these songs are bad, but they don't really do much of anything.
I'm honestly not sure what my personal bottom 5 would be, except it'd probably include Memories of You and Emil/Karma. (At least Amusement Park had the decency to eventually lose to something.)