I'm one of the MCW people. Can't tell you much about the other schools, but can tell you about MCW.
Positives:
Good academic reputation. Was #50 on the research schools list last year, fell off this year despite dramatic increase in research money.
First two years very flexible schedule. Not as many hours of class as some schools. Block exams every month are a real positive according to everyone I know in my class. This gives you time off from studying for a week or two after the exams with plenty of time to catch up and do well. If you learn better by reading than lecture, MCW is great with an awesome note system run by the students. You can pick and choose if you want to go to class or not.
Anatomy, neuroscience, pharm, most of pathology classes are very well taught with great professors who are very helpful.
Big class (200) lets you find your niche of friends that share your interests so that you can enjoy your time in school
People generally do well on USMLE Step I (don't know averages).
Clincal education is just as strong as bigger cities like NYC because our hospital is basically the only tertiary care hospital and Level 1 trauma center for all of Southeastern Wisconsin (Population base about 2 million).
If desired, can rotate at private hospitals around town to get a different view of medicine.
Lots of Californians means that residency programs in Cali have heard of the school and you have a good chance of going back there if you want to.
Great matches, especially at midwest programs where the school has a good reputation. Especially strong specialties include Pediatrics (awesome Children's Hospital) and anesthesia (top 10 program). Others specialties also strong (med, surg, radiology, OB/GYN).
NEGATIVES:
A portion of preclinical profs seem to lecture too much on their research interests.
Its really cold for 3-4 months out of the year.
Milwaukee is a smaller city than some of the other programs, but it kinda grows on you after a while.
Traditional preclinical curriculum with a few PBLs and the rest lectures, not organ system based.
Thats about it from me. Congrats on having choice of where to go and good luck.