I think Coldplay's style is really unique and interesting, and I give them a lot of respect for being able to make it without ripping off of other artists and by basically revolutionizing "alternative" rock, but they're not like the majority of these mainstream alternative bands. They really have their own style, for which I think they deserve a lot of respect.
However, as Finn said, they are quite dull for me to listen to. The only songs I liked were X and Y, Clocks, and The Scientist. Their new songs bore me (Viva La Vida, for example) too much.