I only ever really learned D&D from a friend who designs games for fun. I have been forced to DM for years (poorly as i have crummy math skills and our games were D&D 3rd Ed.) I would prefer to be a player so that i might absorb some good DM-ing skills and get a feel for that side of the table again. I am more used to tactical play styles but would like to become more able with roleplaying. I ABHOR puzzles in an RPG; no reason I just don't like them. I love playing monstrous characters and strangely templated characters.
As a DM i use a homebrewed kitchensink world. If its out there I'll probably allow it. I have my own book of over 300 monsters that I add too constantly. I enjoy running oddball monsters, and not just my own. My prime goal as a DM is to run a good game that everyone at the table can enjoy.
I once played nearly every day for about 2 years. Now i have 2 kids and a wife and get to play maybe once every 2 weeks. I have played D&D primarily but also D20 Modern, Castles & Crusades, and several others in short stints.