DMM is horrible. I flew in and spent an hour and a half being moved from one desk to another wanting this bit of paper and that, finally assembling what was needed to get through immigration. I think they are too fond of Terry Gilliam's 'Brazil' there.

The border guard who let me in kept asking questions I didn't understand. It sounded like he was asking me if I am an Argentine. Finally he let me through.

Flying out, it seemed they had never seen an airline ticket before. A small army of people huddled over my paper ticket and made three phone calls before finally letting me through.

My visa was single entry, which seems to be a meeting of the minds.

As a commuting student, I have gone through the DMM airport quite a number of times. I have also been to almost every other airport in the Gulf as well as a few others.
What can I say about an airport where no employee can speak English! This is an international airport for crying out loud. The least they can do is teach every employee some other language other than their own so they can at least COMMUNICATE to the passengers. You know, that sometimes comes in handy.