I agree with eomer. Shelob should have been in TTT.
But then, I think that the only acceptable of the three movies is FotR.
The unnecessary changes in TTT made me so angry that I wanted to leave the theatre when I first saw it.
Come on, Haldir in Helms Deep? And then he dies like in a bad western with Aragorn screaming "HAAAAAALDIIIIIIIIIIR" (imagine hearing that in slow-motion)
And then Faramir who is a much wiser person than his brother turns out to be a thread to Frodo.
It just sucks.
And then, as eomer said, the audience is left with gollum giving hints about Shelob.
And I agree, the part of Helms depp should have been shorter. and he could have left out that ridicolous Robin Hood scene of Legolas.
Ok I'll stop now...
Shelob for TTT!