In order to get a good baked potato, one must start with the correct potato,
Nuke it for the proper length of time,
And then, a little patience, will pay off nicely.
Step 1: Identifying the proper 'tator
It is a high starch potato, which will remain firm but not hard after baking. .
Step 2: Prepare that 'tator
Wash / scrub it well with water (NO soap or detergent of any kind). But you may use a clean brush (a tooth brush works well if you haven't bought a special vegetable brush).
Poke holes in it. This is so that trapped steam in the potato doesn't cause the skin to bubble and burst in places and so, even if it doesn't burst, it may overcook in those areas.
Raise above the microwave bottom. Place in a plate (microwave safe) and on a paper one also. This allows the microwaves to get underneath the potato.
I, personally, like to smear a bit of Olive oil onto the potato (some prefer bacon grease, but that is high in cholesterol ). But, even if you do not put oil on the potato, there is no need to dry it. Many actually recommend keeping it a bit wet to keep the skin from drying or wrinkling.