My list for campaign would be:
- Halo CE/Halo 2: I find it really difficult to rank these games, I think they have the same quality in terms of story, gameplay, variety, scenary design and freedom. The music was the best in my opinion.
- Halo 3: those battles with Scarabs, tanks and hornets were awesome; Remember The Ark, Halo... the enemies were so balanced and you could use practically any weapon or vehicle, and the difficulty was right. It introduced new types of flood, however, the Elites dissapeared as enemies. I find the music really good too, but a bit more silenced. It introduced 4 player coop.
- Halo 4: this one had really good graphics and reintroduced the elites. But in my opinion, the brutes and the flood shouldn't have been removed, they have an esence and the brutes were still in war with humans, unlike the elites, which were allies; that made me think about its story. You don't explore any new ring... what is very important in an Halo title. The difficulty was toned down a bit, but the Prometheans added a new challenge.
- Halo Reach: this one had an interesting and sad story, the graphics were very realistic and the enemies were diverse. The difficulty was a bit harder than Halo 3, maybe because of the strong elites and brutes. Some levels, like the one in the space added something new to Halo. I didn't like the soundtrack out of the menu music.
- Halo 5: Guardians: this one was hard to rank. The scenaries were incredibly beautiful and detailed, and the cinematics too, but the enemies were so overbuffed that you couldn't kill a hunter with 4 grenades and the Hydra launcher, and the promethean knights were practically invincibles even with the precision tricks... The Warden was a big challenge, but it was overused again and again. I couldn't understand Halo 5's story so much, and I didn't like the split in two teams or the end... Again, I can't understand why they didn't include a ring.
My list for multiplayer would be:
- Halo 2 Classic: it improved Halo CE weapon sandbox, balanced vehicles, maintained the quality of the maps and improved it... Objective games were awesome, for example, in capture the flag you could use your intelligence and be strategical because you weren't positioned with an arrow. The speed was right and dual wielding was incredible, although the br made it a bit useless sometimes.
- Halo 3: it improved Halo 2, but the melee was changed, the speed was slowed down, the vehicles were overpowered for me... The scenaries were right for the most part. The objective games weren't as funny as the Halo 2 ones due to the reason I said before.
- Halo 5: the gameplay was a bit changed, but mixed with the abilities and classic Halos multiplayer. The weapon sandbox was incredibly balanced, making guns like the Light Rifle useful. You had a timer to control weapon spawns and a map indicator of the position, so it didn't matter if you were new to the map. Some scenaries were so simple or too undetailed. Gametypes like capture the flag were arruined for me, the flag had to be in the base to make a point. This forge was the most complete.
- Halo 2 Anniversary: it was very similar to Halo 2, but with a less ranged melee and the Halo 4 bullet magnetism. I think the speed was slower, and the maps were too detailed; you couldn't see some enemies and the fps were really slow. This made aiming very inconsistent. Dual wielding was nerfed. It had only 6 or 7 maps, but the forge tool was awesome.
- Halo 4: it was the game for all types of people. You could choose your weapons, you had abilities and there were lots of gametypes very well explained with voice and text. It was very funny.
- Halo Reach: it had loadouts too, but the scenaries were the campaign ones or were really ugly. Some gametypes were removed, but the weapons were good and the forge was really good.