Perhaps I worded that wrong then, I meant that, yes some aspects were in other games, but Halo perfected them, but those weren't the innovations.
About the the innovations though.
My questions are still out there to be answered as well. Let's recap.
INNOVATION 1
In what other game can you modify maps with a group of friends and create an almost infinite amount of possibilities because you can change spawn rates, amount of items on each map, spawn areas, etc (remember, you and all your friends can be doing this at the same time, in the exact same session)?
INNOVATION 2
In what other game is every kill, every achievement ever won, every type of weapon used for a kill, every death kept and maintained on a website that you can view at your leisure?
INNOVATION 3
In what other game can you take a screenshot from any of your 30 previously played games and download a high-res version to use to do whatever on your computer?
INNOVATION 4 (ok so it was introduced in halo 2, but perfected in 3.)
In what other games is there a seemingly perfect party system that allows you to be matched up with others at your same skill level? (I am not saying the matchmaking is perfect, but the party system is spot on)