Pros
Lots and lots of smart and friendly people, a diverse workforce and great access to training resources. A great place to start a tech career and become a well rounded person with a focus on technology. Work with the newest Microsoft technologies, and get your certifications on the house. Please customers and managers, show ambition for technology and working with people, and please customers and managers and you can move very quickly.
Cons
Avanade has trouble deciding if it cares more about its consultants or its customers. Lots of movement and reorganization at the leadership level, with constant reminders to the rank-and-file that it "doesn't change your day job", plus heavy focus on customers leaves many consultants feeling disconnected from the organization. Talks the talk when it comes to collaboration and sharing between employees, but doesn't walk the walk - the community discussion groups (supported purely by the goodwill of the many smart consultants) are a good resource but don't expect an environment where you can work on and contribute meaningful assets unless you can turn them into money trees immediately. Swears up and down that they are not becoming Accenture, which appears less and less true every day.