I am about a year from Medicare, so I am interested in this thread.
Packman, from what I can tell, choosing MA or a Supplement is a process with two parts. First is the evaluation of MA plans, and that is difficult if you are not making much use of doctors. Looking up some facilities for specific conditions (I checked stroke and cancer facilities) was helpful, but, as pointed out above, these can change. Still, considering that I am in a health-facility-rich area, I think I can be confident that this state employee retiree plan will include some top facilities.
Second, though is the simple decision: a MA plan will not include any facility anywhere that accepts Medicare, though it might include some. You can't just say to yourself, "I'm going to the Mayo Clinic," and be confident that you can do it. Nor can you necessarily choose the most convenient skilled nursing facility, although, again, in an area inundated with health care, you probably can find something convenient and good. Balanced against that is the substantially lower cost and possibly more extensive benefits of an MA plan.
I'm supposed to talk soon to several people who are pretty much dead set against MA plans because of spousal experiences, and one of my angles will be to find out whether they had "good" MA plans or not.