I didn't mind them when I first heard them, but they released a string of singles soon after (this was around 2003) that sounded so damn samey, and at the same time they were all over the press, so I started hating them. I don't know how good/bad their album tracks are, but I don't care, their singles all sound the same, and are basically what Thom Yorke would write if he had 50% of his current IQ, and a gigantic tree trunk stuck up his arse.
It doesn't help I think Chris Martin is a gynormous douche. The only good things he's ever done is poking at his public image in both Extras and Shaun of the Dead.