By saying "he is the worst composer" I suppose you can do better?
Personally I think Zimmer is awesome - and, no I don't like all of his work.
Hannibal (except one track) springs to mind.
The Last Samauri, Gladiator, The Rock, Crimson Tide and Pearl Harbour I love to listen to.
If only I could compose like this man...
I haven't listened to King Arthur yet but I'm tempted to go and buy it on the strength of the review here alone. Zimmer and Enya-esque music combined - heaven!