I prefer steaks medium, but I can tolerate medium rare. Which is good, because my ability to properly judge the cook on a steak is dodgy.
Rare, at most medium rare.
I once tried blue, but outside some very specific occasions (e.g. some sashimi) I don't think it works that well.
Medium for the most part. I tend to like garnishes and sides with my steak. I make a good creamed spinach based on a recipe I found online that no longer exists...