Halo 2 was the start of something...even though Halo: CE was really something, the story never really took off till Halo 2. This game had everything like the start of online multiplayer and skulls (like the popular Grunt Birthday Party skull). The soundtrack was a masterpiece and was so popular that a second volume had to be released. Without the storyline that Halo 2 created, how different would Operation: First Strike and Halo 3: ODST be? It might not be that different, sorry. But those little things in Halo 2 like the first glympse of the planet Reach with the Pillar of Autumn fleeing from it, High Charity, those unique background sounds when on Delta Halo and the amazement after discovering dual-wield. This game was a godsend, not to mention the Covenant's perspective from the Arbiter while he was racing the UNSC to the index. The Arbiter and Master Chief also meet eyes with the GREAT SCHISM and turned the Coventant into a massive war (Elite v Brute material) with the Master Chief still continuing to chase the prophets through High Charity to the Forerunner Dreadnought with Cortana guiding him. Who can forget those 5 marines you get to rescues and give them each a beam rifle? Lot of fun, especially when the Chief assaults the Mausoleum of the Arbiter where the Elites were falling back to after the Great Schism with Breaking Benjamin blasting in the background. The setting created was truly remarkable. What better way to finish the game with the Flood invading the city?
So please, a remake of Halo 2 will be more than just an attempt at remaking the whole trilogy (I'd rather see a remake of Halo 2 a hell of a lot more than a remake of Halo 3), it does have a special place in the trilogy. Think of the graphics when looking out to High Charity, the Scarab (or maybe not the Scarab), the view of Earth the Reach from space and multiplayer!
A remake of Halo 2...
It would be huge.