Im going to do all of these from a competitive 4v4 aspect, since that’s all I really know from Halo.
Best - Midship.
Easily the best map made on Halo, it just managed to fit so well into pretty much every game type. The only map that comes close is Wizard from Halo CE, which was a far better version of Warlock due to the power-up locations and most importantly the increased vision. Midship however was a map that just never got dull. Even today I could happily sit and play Midship for hours on end in different game types, and I’m not even a huge Halo 2 fan.
Worst - The Pit
I to this day do not get why people think this is worthy of a competitive map. The map had potential, right up until the put a huge wall ALL The way across the middle. It just made the map a complete stand-off fest. With only one power weapon and one power-up in the middle, both on really long spawn times, there was no reason to ever move to the other side of the map if you had the lead. Then there was the idea to play King on it. The distance to run between points because of the stupid wall was unreal.
Favorite - Rat Race
Sure, it may not be the best, but it was still a great map. Playing TDM and CTF on this map was easily my favorite time on Halo CE. Don’t get me wrong, if I was to do a top 10 map list, 7 or 8 of them would be Halo CE because the maps were just that damn good, but Rat Race stood out amongst them all. I used to LAN so much back in the day with @Bagelzend, @Xeno, @Roozle and @Smidsy and they always bitched when this map was coming up haha.