I am not fortunate enough to fly out of KLIA often enough, the peasant in me means I'm at KLIA2 for at least half of the days in a month. Also on some times of the year if I'm lucky enough I get to fly out of KLIA. My humble 2 sens
The GOOD KLIA
The check in area is spacious enough, which allows for better queue management.
I always think KLIA is one of the most straightforward airports to navigate through, no hidden gates etc. Simple Floor 1 to Floor 5.
The size is relatively small of which the furthest gate is not too far off each other
Walkalators which serves a purpose.
Jaya Grocers, FourFingers
Landside Aerotel Lounge & Hotel
Pretty much the plethora of F&B, Shopping options landside, that even MH & KA cabin crews come to hangout
Actually I do not have much qualms of KLIA other than the old Aerotrain, or the super annoying bubble lift at the satellite terminal which opens and closes at slomo pace.
Yes it may be a bit worn out, but I can live with that. I can get from the aircraft out to land side in record time. I'd take a dated worn out airport over a super blitzy blingy Crazy Rich Asian airport which takes ages to get out from.
The check in area tight, which makes for a inefficient queue management, introduces a lot of bottlenecks which disrupts people flow.
The idea of going through the mall before reaching check in, can be intimidating for some people. Also people who take public transport are often lost at the mall. The complicated labelling of the floors does not help further. The carpark is consist of 5 levels, CP1 to CP5. Gateway is made out of 4 floors, L1, L2, L2M, L3. Arrivals is at L2, Departures is at L3. To get from the carpark I need to get to CP4, walk to L2, take one floor up to L3 etc.
There are some gates which are hard to get to than the other. For example domestic gates, which are located at the K pier. Takes twice as long to get to compared to the ones in J. Which involves an escalator down, a ramp up, and then another two floors down the escalators before arriving at the gate. Gate K18, K20, K22 are hidden behind a big wall, and can be easily missed.
A lot of walking yes, but like many big airports in the world. But I'd be less critical of this because it is highly inevitable for an airport this size.
The scanning machines are not efficiently placed. Often creating massive bottlenecks.
Most gates at the K/J pier only have around 140 seats, the last time I've counted. Indigo / Cebu Pacific / Scoot / Jetstar / AirAsia has a full load of 180-186 passengers.
While I agree Tony can be a bit whiny at times, to an extent ANNOYING, apart from the SUPERFICIAL stuff here is what he has to deal with as the largest operator there. Remember everything is not about you.
KLIA2 is built over soft land, the tarmac sinks, and because of that constant resurfacing of the tarmac has been going on since day 1. I lost count of how many times an aircraft has rolled back, jumped over the chocks, causing damage to the nose gear, and also shearing of the towbar. The depressions can be knee length deep.
The constant resurfacing has caused many closures to taxiways, which results in inefficiencies during taxi.
Runway 33 seems to be closed more often for ad hoc emergency repairs compared to 32L and 32R.
Ruptured Fuel Lines
There are stuff regarding operational crew welfare which I can go on and on, if anyone of you would like to know please buy me a cup of tea.
Just like everyone, I get annoyed and tired too of the incessant bickering vetween AK and MAHB, but I feel the terminal is a wasted opportunity. Then again I may not be as well traveled as most of the people here so what do i know.