There are some serious critics, some unserious ones. Especially the sophisticated sites are really positiv about Mylo Xyloto, also in Germany. Often the more unserious papers like DailyMail are really harsh.
I don't see that the majority of the critics is bad, really. I mostly read positive reviews. Of course they are also some negative ones but taste is different and don't forget: Coldplay is the biggest band in the world - there will be always criticism no matter what they do.