Out of the 5 Bungie games it was by far the worst one imo.
My two biggest issues with that game are the split story (annoying as -blam!-, also terrible) and the health system (really -blam!-ing terrible). Not to mention they nerfed or removed the good weapons and added subpar replacements.
It's a game that I played once because I had no patience for its bullshit.
Maybe I'm just too caught up in Halo CE nostalgia.
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Also Halo 2 brought in the missions The Arbiter and The Oracle. These missions gave use the POV for the top covenant commander. This was one long mission but was cut down because it's length. Don't forget about the REX sword and SCARAB gun.