People are like sheep,one has a minor issue with a delay (because obviously THEY are in a hurry and THEY are so important) and everyone jumps on it.People think they can moan about everything instead of just chilling and waiting their turn.The internet is the perfect vessel for these moaners - one of its faults is that it lets anybody 'start a fight' so to speak.
From my own experience of Manchester I can say I have never had much of a delay at any stage of progressing through it at all times of the day and night - indeed the only delay I have had recently was at Stansted getting through control - but I made my flight so everything was okay.In fact the only reason TOO moan is if you miss your flight - everything else is just piffle by people who spend their whole life moaning and can never be satisfied.