Why is Halo 2 considered to be so good?

[Dangit2019]

not to mention a half hearted storyline trying to wrap things up, which arguably ended with a final confrontation a lot of people felt was rather... lacking. Hence saying Halo peaked with "Halo 2".

Oh, dude, why did you have to remind me of that fight...

I WILL DESTROY YOU
(shoots laser 3 times)
AHH I HAD SO MUCH TO LIVE FORRRRRRRRR

 

[Dangit2019]

The Flood-centered levels really represent to me what FPSs are at their lowest: mindlessly gunning down identical enemies in a dark, confusing, corridor.

Halo 2 was a while ago, those kinds of encounters in FPS where not quite as annoying then. Eight more years of it since has really gotten old.

most people missed the entire point of the flood, the was there to change the flow of play, from going from covenant taking cover and flanking you etc to nob rots that just try to flood you in numbers
same as gears of war, locust-covenant glowies-flood
change the pace of combat to break it up.

Yeah, but it was sort of a negative change of pace to go from sprawling landscapes and huge battles in the city scenes to scratching your head through dark corridor #946.