People really need to stop. Halo has never been a game series that defined the Xbox hardware because of it's cutting edge graphics.
With the exception of Halo 4 and possibly Reach, while Halo has never been a bad looking game, they never had the ebst visuals on their respective hardware. Halo 1 had a clean and simplistic art style with great use of colour, but it was not the best looking game. Even Halo 2 had issues with some unfinisged texture work in some levels and really bad graphic pop-in.
Halo 3's saving grace was it's lighting system, but it was massively criticized online for being cartoony and not gritty/realistic enough. That was the Gears of War effect.
Bungie even took shortcuts by using matte paintings in cinematics instead of rendering physical objects.
Halo Reach sacrificed alot of colour in order to acheive it's visuals and it's lighting at times is even less advanced than what was in Halo 3. With Halo 4 alot was sacrificed to get it to look as graphic ally impressive as it does. Environment textures look rough in areas, levels are more linear, lighting took a hit, AI was downgraded, weapons despawn faster, lighting was even more downgraded, ect.
Halo 5 looks pretty much the same as Halo 4, it doesn't have any noticable graphical improvements other than resolution, even then splitscreen, blood splatters and even lighting was downgraded from the Beta in order to achieve a solid 60fps.
Halo has enevr had the most cutting edge graphics, or atleast not without sacrifices. But what it did well by taking advantage of Xbox hardware was in regards to it's implementation of AI, level design, weapon sandbox, game options, audio, ect. Halo Infinite's graphics will improve from here. I'm not expecting the best graphics in the industry, but it's already looking great especially with what 343i are trying to achieve with the campaign and giving fans what they want especially in regards to splitscreen and couch co-op. Alot of the comparisons to other games just don't work as they either don't offer what Halo does or they are more scripted. If graphics are such an important factor, then why do games with less impressive visuals like Minecraft and Fortnite command such a wide audience?