In my experience of playing the Halo games, I have noted that the most difficult game is by far Halo: 2(In my opinion). So I have a quite simple question for all of you, What Halo game is the most difficult in YOUR opinion?

Mine is Halo: 2. I think Halo: 2 is the most difficult because of the fact that you are quite underpowered towards the enemy, it takes 4-5 rounds from a sniper rifle to kill an Elite Ultra on legendary. And those jackal snipers are a pain in the ass. these are just examples though. Its still a great game. This is just my opinion. Do you agree or disagree?