I'll speak up for moss as a medium for Phalaenopsis. I have 5 Phal or Dtps orchids in moss and they're all doing great -- one is a rescue, even, that's putting out a new leaf way before I thought it would. I also have a few moisture-loving mini vandaceous hybrids, an Aerides and a Haraella in it -- these all have similar watering needs to Phalaenopsis. Moss is good for orchids that want even hydration, and most people I know, whether they're hobbyists growing in their houses (that's me) or serious growers with huge greenhouses use sphagnum moss for Phals. Not all, but most. The moss itself is rot-resistant -- you can use sphagnum to dress wounds. Usually, Phals succumb to crown rot, as kiwiorchids described, not root rot.
Actually, other than two of the first orchids I ever bought, years ago, the only problems I've ever had with rot have been with plants in bark. These were plants that just needed less water and more air than I gave them, even with the freer-draining medium.
Success with any aspect of orchid growing does depend on your conditions, though, so if you don't know people growing orchids in your area, let us know where you are and what kind of circumstances you have -- humidity, light, air circulation -- and there are probably people on this board who could speak from similar conditions. But definitely don't give up. Everybody sends a few to orchid heaven on the way to figuring them out.