Divine Mercy controversy

I was reading the comments in an article in the National Catholic Register about the beatification of Pope Paul VI (something one should never do), and I was very surprised at the hostility on the part of what appeared to be traditionalists towards the Divine Mercy devotion. I did not realize that there was a traditionalist critique of the devotion. Nor did anyone explain the basis of the critique.

I was also wondering why people who think everything that happened in the Church since 1960 is evil are reading the National Catholic Register.