I have one - it was the first camera I bought for myself, and the only camera I have ever bought new.
Pluses:
- Large bright viewfinder
- Small, light camera body
- Lots of high-quality 'M' and 'A' manual prime lenses
Minuses:
- metering cell can loose sensitivity
- metering circuit corrodes and underexposes (scrub the ASA dial back and forth to cure)
- some people hate the buttons for setting shutter speed manually
- Good zooms can be hard to find
- Pro-zooms all came later, and are pricey.
Loads of ME supers were sold, so spares and replacements are easy to come by if you're handy.
Mine still works well, despite a punishing life as my mountaineering and travelling camera. Although I don't do much 35 mm these days, it is my carry-around B+W camera, and the one I take to social occasions where I want a proper camera, but nothing large or obtrusive.