My experience has been positive.
Their team has been doing good work. For example, Azure had the first/best Docker integration of all the cloud providers. What they had was superseded by docker-machine and swarm eventually, but they were definitely thinking ahead of the curve.
As a user of Azure, I admit that find some aspects of the service unusual, such as requiring users to pick a globally-unique identifier for every server they boot. As in, they ask you to provide a string for your instance's name, then they provide a hostname based on that string; if the hostname (thus the name you pick) is taken, you'll get an error.