It disgusts me to no end to see how easily people are swayed into liking new things for no reason... it's equally gross however, how quickly a "fan" can turn on a band. If you like a group's music and within an album or two hate them, then you were never a fan, but merely someone who liked a particular album (just as retarded as a trend-follower).
Times change and so do artists. Musical sounds will evolve and consequently bands will put out different sounding CDs. What is crucial however is that you respect and realise how talented these artists actually are and appreciate their new music for what it has become, where it began, and the entire journey in between!
Stop being such 1 dimensional idiots and learn how to expand your mind and appreciate different sounding music!