If refs weren't so shit at their jobs then players wouldnt need to dive.
How many times have we seen players try and stay on their feet only to lose possession and ref wave play on. Players need to go down to get the refs attention which is more of an issue for me. If refs see the player has been impeaded, he should blow his whilstle but often doesnt do so till the player goes down. (Not in advantageous circumstances obviously)