Hey Halo 2 was the best in the series by far, competitive-wise. It is understandable why people where still playing when H3 came out and up until the servers were shut off.
Halo 3 was not as great but still had great competitive options.
REACH, well, when you know there is a massive luck factor (blooming crosshair), fudged and unneeded mechanics (healthpacks), and slow and semi-skillless gameplay (nigh-impossible to do anything if your facing off against 2 or more opponents alone) , I really am not interested in it. Especially with Bungie running around with a stick up there ass thinking this game is the best in the world and refusing to take any criticism in any form.