But honestly, do you agree that each of his movies have been worse than those before it?

Rank them for me, if you don't mind. Mine goes Sixth Sense, Village, Unbreakable, Signs, Lady in the Water. With Happening unranked since I haven't seen it, but I'm relatively confident it's going to fall among the latter two.

At the very least he's been on a negative slope since Sixth Sense.

Is it his ego - him thinking he can take any idea (however flawed or weak) and make it into a good movie? The concepts behind his last few movies have been pretty weak.