I like to play with secrecies. It's more fun when you don't know what's in what until either it's too late or that lucky shot that took out the powerfist armed squad of temies first turn before they even got out the deployment zone.
However I have played against many poorly written and added up lists. I have seen the list with 4 elite choices. The list where the game is set at 2,000 pts and the opponent has 2250. The list where the opponent has taken an upgrade for a unit that can't have it or a transport the unit is not entitled to. I've seen this so many times that the gaming circle I ran in had a rule that your opponent could see your list and fact check it before the game began. We even did the whole one model representing the unit riding atop the transport vehicle just so we knew which is which.