University of Michigan Internal Medicine

This is the health center I go to, and I’d recommend it to anyone. Full disclosure: I know someone who works on the clerical staff here. I think I’d like it a lot even if I didn’t have an acquaintance there, though.
The building is really comfortable, with lots of comfy chairs in the waiting area. The front desk staff is nice, and so are the medical assistants.
The wait to be seen really depends on a) what doctor you’re seeing and b) what time you visit. Some doctors are very prompt. Jenny Hsu and David Cooke have reasonable wait times. I’ve waited more than an hour past my appointment time to see Dr. Chen, though. If you schedule your appointments for early morning or just after lunch, though, you’ll have a better chance of being seen relatively on time by most of the doctors.