When I first opened the hood on my Titanium in April, I thought, oh wow, a big piece of plastic instead of a cool aluminum valve cover or something. (I go to a lot of classic car shows so newer cars are almost always a disappointment.) But, the service manager told me the cover was primarily for noise suppression. I'm sad to say I don't think this engine is that cool looking with the cover off. And, there IS a functional reason for the cover along with the fact that it looks clean and has an emblem.
Someone did make a good counter-point about heat disputation. So as usual , list points in the pros and cons columns and make your own call.