I used to have a coworker that would constantly bug me about how awesome HAML is, but whenever I looked at HAML code all I saw was noise. Brandon Keepers has done a much better job at explaining why you should avoid HAML:
I agree that HAML is easier to write than HTML, simply because it involves less typing. But I feel it is infinitely harder to read. While the indentation makes it easy to see the nesting, the extremely overloaded synax requires careful attention to each line.
In my opinion, if you hate writing HTML a much better option is Zen Coding.