I hear ya and do agree to a certain extent but i think it's the joy it can bring people, how a simple 3/4 minute song can turn you crappy day into a good day and change your mood. Modern pop music proves your point exactly, but older pop music still carries this happy vibe! Who doesn't want to hear chumbawumba when they're feeling down, stuck at work or out with their friends!
Sometimes music doesn't have to sound the best, sometimes it's the memory attached to it, something to make a person smile again.