I see what you're saying RM, I just go back to my initial point that the whole idea is to eliminate the really bad decision .. the "Rudi Koertzen" as it were.
We've all seen them, the moment the umpire's finger goes up we think "Oh no, that's a shocker". The 3rd umpire and match referee would also have similar thoughts, so they would immediately signal to the umpires that they are reviewing the decision, and ask the batsman to hang around.
We saw one in the 1st Test where Johnson was given out. There was no white mark in hot spot, but still given out because there was no evidience to suggest he didn't hit it. Later angle shots showed he didn't. That to me means the system doesn't work as well as everyone was hoping it would.
Then watching Gayle standing his ground after the most plum LBW imaginable was too much for me. I simply do not like the system. It's another time wasting aggravation we don't need.
For the really close decisions, just let the two umpires in the middle make the call. Afterall, they are in the best position.