Yeah I found Ghost Stories to be the worst, and Mylo Xyloto to be the second worst, and I can say that for good. The first 4 albums were all great in their own way, and no one album was completely better than another in every aspect. But when it comes to MX and GS, they are pretty much not so good.
I really want them to create something like their first 4 albums, especially Parachutes and Viva La Vida. I really, really want them to get away from the terrible pop inspired music that they are moving towards. Ive never disliked a Coldplay song until I heard A Sky Full of Stars as it had such a non-Coldplay sound to it.