Are the immigration delays at KLIA to be routinely expected?

Actually it depends on the flight schedule...

Lets say per 1 hour, normal flow is 5-6 flight to departure or arrive, but u said that u have to wait bout 3 hour to clear immigration, that's mean bout 10-15 flight departure at the same time (for international flight only, not included for domestic flight)

So imagine 10-15 flight passenger (bout 200-300 passengers per 1 air-craft) 'Q' in the immigration line, how pack is it??

Normally pack hour in the immigration line starts early in the morning (6-9.30am), afternoon (12-2pm) and in the night (8-9.30pm) and this is for the departure only.

Meanwhile for arrival flight just 2 or 4 hours gab only from departure flight...

It's true that the sky train or Aero-train being closed for upgrading maintenance but it won't effect on immigration 'Q' but only for departure gate passengers~

You go to a foreign country , we follow their own rules in qualifying visitors to their country, my best advise is appreciate Malaysia's stringent evaluation of aliens in their country . so we are sure that the people we meet in the streets have been qualified well and not a threat to our safety .

Anyway , the Malaysia experience I have every time I visit Malaysia is always worth the waiting in line .

Enjoy and bask in the experience of good food , varied culture and taste and the shopping is great in terms of price and variety.