MAS could be best described as 'good value for money'. It is full service and the staff are generally friendly.
MAS (Malaysia airline system) life story has been 'keeping up with singapore airlines'. So, their fleet is new, and in economy on a lot of their airplanes they have personal tvs. And, they are one of the few asian airlines that uses the boeing 737-400. They've got a large fleet of them, and you can even see them in destinations like Hong Kong.
Remeber they are not SIA, and i would put both CX and SIA above Malaysia, but if they have a cheap ticket, i would buy it. For example, i may have a choice between britannia airways and MAS from Australia to UK, at a similar price. MAS service would leave the others for dead. They seem to look after western passengers a little bit better than local malay's. It seems they try and pay special attention to them. After all, this company and country needs all of those foreign dollars. Its basically good service and product at good prices. i give them 8 out of ten, overall, and 9 out of ten for value for money.