Pros
Strong technologists with heavy Microsoft enterprise experience. Many strong customers, and the opportunity to reach into Fortune ranked corporations through their extended partnerships with Accenture and Microsoft. On-the-ground experiences for consultants. You will have the opportunity to represent Avanade at a customer site; you will not be in the background or be shielded. You will interact with the customer and your opinions will be valued.
Cons
Standard consulting cons apply here. It's difficult to "choose" your project and that can interfere/conflict with what your personal/professional goals are. The promotion process is hazy. You need to fit the organizational mold in order to move up. Accenture projects will more-than-likely dominate your docket. A common gripe among Avanade resources is that Accenture treats Avanade resources very poorly on projects. Many conflicting goals and values between the two organizations, and there's little recourse for Avanade resources to meaningfully report conflicts between Avanade & Accenture (and produce amicable results).