Everyone is entitled to their opinion of course, I suppose it's a matter of taste after all. I just can't help the feeling that they are no longer doing their best nor putting 100% into their music. Sure, there may be nice musical hooks here and there, but as a whole it just feels quite shallow.
As to artists changing their style and experimenting, maybe I'm just old fashioned but sometimes I think it would be better to keep doing what you're good at instead of forcefully trying to do something different just for the sake of it and ending up with a forced and pretentious result...
Keeping your style doesn't mean that you can't create something new! It just means that even the new stuff sounds like you.