Pluspunten
There are a lot of smart people around, you can learn a ton from others. it is a great way to get solid experience especially when you are right out of college. There is a diversity of jobs you can hold within different divisions that are very different from one another. There are really several companies within Microsoft, the culture and the type of work within Windows or office for example is completely different from what you will find in the Xbox or the Windows Mobile division. Another positive aspect is the job flexibility, if you like to sleep in the morning, it is ok to show up at noon if you woudl like as long as you get your job done.
Minpunten
one of the key component missing is the startup feel in which people take more risks and try new things more easily. People sometimes focus on looking good to management, improving their review or overfucusing on the result for this fiscal year or quarter rather than doing on the right thing for the company for the long term.