I have a reverse question, what is better than Markdown in your mind? I'm starting a project that is heavily based around text, and for simplicity i just wanted plain text. Ie, i have no editor for the project. So for markup, i need something. What do you feel is the right markup language?
Personally i feel Markdown is easiest markup language i've found. Compared to some, it's quite intuitive. Combined with the fact that it is becoming quite prominent means users are also learning it. The only downfall with Markdown in my mind is a lack of a standard, but i think that's being worked on (there are some attempts at that, i believe).
Anyway.. i would really appreciate your feedback, if you feel there are better pure text Markup languages :)