Tell me about Halo 2

Although Halo 2 was the first Halo I’ve ever played, I never had the opportunity to play it online. I could play it on the MCC, though I haven’t gotten around to it yet. Every Halo game seems to polarize members of the Halo community and divide them in one way or another, so I want to ask something of any Halo 2 veterans here, the ones who prefer Halo 2 above all.

What is it about Halo 2’s multiplayer that makes it more appealing than the others? What changes in future games do you dislike? And lastly, can you tell me about your best moment from Halo 2 online?