I actually really liked to the Eye in the first two movies and very much enjoyed how they made Sauron in the Prologue, but in ROTK I found the twitchy lighthouse to be ridiculous, and stupid.
I laughed when the tower fell over and the pupil was dilating and constricting in a very laughable way, like *oh crap oh crap I'm falling and theres nothing I can do!* And I really think that when the tower was destroyed that I shoudn't have found it comical. And the beam of light what the heck was that all about?
I believe that having Sauron appear as a black cloud type figure then being swept away by the wind would have worked very well in the movie version. Who knows I might have even found the twitchyness to be tolerable, (except when the tower falls over, something else should have happened like the eye just disappearing or going up in a spiral of flame than doing the black cloud thing) if it wasn't for Sauron The Lighthouse.