I love Halo: combat evolved and play it all the time. on the other hand, my brother says halo 2 is the best. the thing is that halo is great because of the following reasons.
1: the pistol with its zoom in and automatic modes.
2: the assult rifle. sure they brought it back in 3 but they cut the ammo in half.
3: awsome story line.
4: levels are longer so you need more patience to play them.
5: just over all original.
6: you can accually ride the tract pods in co-op.
7: Captin keyes is in it.
8: the flood are a lot more scary.
9: the fact that it was the xbox launch game.
I could probably keep going but these are the reasons that we can all agree on. oh and one more.
10: the end of halo was just awsome, and it left you in the dark if there was going to be a seqal or not. in halo 2, they pretty much ruin the future story line by ending the note on a cliff hanger.
so if you ask me which is better, i will say with out a doubt