Having flown regularly in the region, Ala-maty is one of the better airports, but that really isnt saying much.
I remeber a KLM flight declaring a mayday and the controllers english was so bad that the KLM crew really couldnt understand.
The standard of english by the air traffic controllers is to be quite frank very poor.
They also had a tendency to change the approaches from the published ones which caused no end of confusion.