I had Halo Reach when it first came out, pre-ordered it but then I eventually returned it. I wasn't playing at the time, I was kinda bored, I rationalized returning it, and I did. It's a stupid habit I have.
Bought the Anniversary and it's fun and all, but the multiplayer is..limited. (Any new maps sometime? I'll check it's own forum) Halo 3 is kinda dead, still some players, but not a whole lot. Could be the time. I did enjoy Reach, just thinking about getting it again.