It does have one advantage, actually. And that's that it has no advantages. Doesn't do much for the artist who strives for quality and efficiency, but for a hobby pixel artist, being able to click a link and say "I made that in Paint last night" is just too much fun.
Everyone seems to think Paint not only sucks, but is 100% worthless. It's fun to prove them wrong.
And I know I don't pixel much anymore! I'm sorry!!