Too many of the non-pilots posting here just don't get it at all and should shut up for once in their lives and listen. It has been repeatedly explained to you that aircraft/crew being delayed are not the fault of the crew. I won't waste my time explaining again some of the reasons that have already been mentioned here. READ THEM!
When are passengers, especially snotty Americans, going to realise that the world does not revolve around you? There are too many factors that must be considered and if you were smart enough and exercised some common sense you would expect some problem to arise each and everytime you make travel arrangements. It's simply the nature of the industry. Weather & technical problems are just some of the things that cause these delays.
Stop being so pig-headed. If you feel you are being "lied" to in the terminal by ground staff about the reason for the delay remember they are GROUND STAFF or perhaps MANAGEMENT. You are not being "lied" to by the cabin crew nor the flight crew so taking it out on them is a sure sign that you are ignorant! Full stop.