The story in Halo is somewhat of a moot point for me so I'm going to just rate multiplayer.
Halo 1 >= 2 > 4 > 3 > Reach
In terms of how fun the game is, I almost consider 1 and 2 equals. Almost. With that said, 4 and 3 on the other hand and I seem to be the minority here, but I actually prefer 4 over 3. Even after playing last night Halo 3's multiplayer is odd just like I remember it being. It's slow (in more ways than one) and has still has people bouncing around thanks to it's amazing netcode. I prefer 4 more because while even though it does have it's issues, the majority of them can be turned off, and when that happens it plays a LOT closer to how quick Halo 2 felt. 3 cannot be made to feel better hardly at all.
Reach has the worst copy/pasta maps from it's own damn campaign and was plagued with reticule bloom. Worst gameplay mechanic ever.
Edited by DualX, 30 July 2014 - 05:14 PM.