Wizards of the Coast's Star Wars Saga Edition RPG was my first rpg. First as a player, and a few months later, first as a GM.
A group of us had decided to try playing RPGs (we knew each other through other gaming, namely HeroClix). We settled on Star Wars because it was something everyone liked. Finding out that the Saga system was due to be released later that year, we waited for it rather than picking up one of the defunct versions.
The reason we stopped playing was that things just kept falling apart. Our first GM didn't even own the book, and was winging it without understanding the system. He eventually stepped down (shortly before we would have asked him to do so). I took over. I'd never done it before, had very little clue what I was doing, and kept stalling for time trying to get inspired. Eventually one of the players lost patience and decided to start GMing, much to my relief. Finally, as this was something he always found himself doing ("DMing by default") he brought things to a halt.
Then we heard that D&D 4E was coming, and it seemed like as good a time as any to try jumping into that game, which I've been playing ever since (as well as, much more successfully this time, DMing).