I'm using "song" in a pejorative sense here, to refer to verse/chorus/verse bullshit. My tastes are pretty eccentric, though.
gibberish can just as readily be bullshit.
power chords can be life-affirming.
4/4 time can be played mind-bogglingly. also you can't make love to your lady (or your fella i suppose) in 7/13, your back, thrown right out, son.
count me on the performance is more important than song side. i don't discount song at all but i've only heard a bob dylan song improved twice and those are great songs. conversely, Otis Redding's version of "A Change is Gonna Come" is just as fantastic as Sam Cooke's original. they are performed differently and they are great for different reasons. the score had little to do with that.