Let's not dismiss the thing too hastily. I think it would work and have a lot more urgency if Anakin and Obi-wan cut through the floor as soon as they are threatened. Take away the jokes and the scene could be fine. As far as Shaak Ti in the hologram, she is barely noticable. I suppose one could paint her out with ease. Of course, you might have to edit a bit in the other introduction of Anakin an Obi-wan to Grevious on the bridge.

I'd love to see this scene re-incorperated into the movie. I have to admit that the motivation isn't anything more than, "Hey, that would be cool to see". Aside from bringing the Grevious threat a bit earlier into the film, this addition doesn't really do anything more than add more action.