They are a full service carrier but there call center in Malaysia is crap, i've had to call them a quite few times and after a certain hour the Australian calls get diverted to the Malaysian one.
The difference between the two call centers is chalk and cheese, Malaysian staff just don't want to help and tell outright lies, Aus one was all helpfull and had my tickets emailed to me (on two totally separate occasions) within minutes. I could go into it further but I think you guys know what i'm on about.

I mentioned this to my wife (she's Malaysian Chinese) and she said thats what everyone puts up with in Malaysia. She did tell me why, but I don't think I should repeat it!

So, the trick? get a cheap phone card, call the Aussie call center (after 7pm KL time) and you might get some service from them.

One thing I will say for MAS though, inflight service is very good, better than the likes of QANTAS. Seat pitch is best in class too, 34" in economy vs 31" in QANTAS, 32" Cathay.