Good one; I still remember back in the 6th gen how "wow" it was to be able to play PC stuff like Doom 3 or Morrowind or Half-Life 2 on a console.

And yeah, ease of development too, none of Xbox's consoles were as tricky to work with as say PS2, PS3, N64, Wii, Wii U, Saturn, etc.

I was speaking to the infrastructure and how well it all worked. Before Xbox Live, the best us console gamers had had was Dreamcast and bare-bones Sega.net. Compared to that, XBL was an epiphany.

There are a few things, but ill mention my personal favorites from each gen.
quick resume: it's a game changer and playing on a console without it really shows.
BC: obviously not the first console to do it, but MS being dedicated to it after Sony and Nintendo abandoned it the previous gen was a wise decision. It was enough of big deal for Sony and Nintendo to go back to offering it.
Achievements, controller, and online: The 360 was the peak for Xbox and we got some great stuff out of it like the following.
Internal hard drive and Xbox Live: Internal harddrive gave the original Xbox a nice advantage over the competition. Xbox live paved the way for online gaming we see today.

Yeah the most I miss from Series X is quick resume for multiple games. PS5 is great but suspend mode kinda sucks.

How does XBox handle updates for a game that has been suspended? I lost my 24h race in GT7 due to an update during suspend mode closing the game. Always online games suck, even if it wouldn't have done the update it would not connect to the server anymore (version mismatch) and abort the 'offline' race.

And often while doing 24h races I wished I could play something else in between instead of having my ps5 held 'hostage' in suspend mode. The irony is I don't have multiple games to switch between on Series X sigh. FS2024 would have been a great candidate for that but playing that on PS5 for the VR support (beta now available to all). Another 'hostage' situation if I want to suspend longer flights doh!

I actually didn't know the Series could suspend + resume multiple games at once, that's actually a really cool feature.

Being able to suspend/resume one game on Switch/2 is great, but multiple would be a gamechanger (heh) as I wouldn't have to get to save point/checkpoint in one if I wanted to play something else.

Me too. And also, nearly half of new physical PS4/PS5 games I order arrive with the disc loose in the box. Never have had this problem with physical Xbox games.

Speaking of hardware, one thing I think they do pretty well for the most part is engineering.

Yeah the RROD was a fuckup and the base Xbone and Series S were arguably a bit underpowered, but the OG Xbox, 360, Xbox One X and Xbox Series X were very powerful for their time and that power was easy to harness.

I really really like their Quick Resume option. This should be standard on all consoles and they need to figure out a way to do it for PC.

I hate that shit so much. I know exactly what youre talking about. Even ps3 games had that issue occasionally, although it was never as bad as ps4. I miagine ps5 is just as bad if not worse, i just havent bought enough games for it. 

The One X in particular really impresses me since just a year later and not only did they make it significantly smaller than the PS4 Pro, they somehow made it a little smaller than the One S without causing any issues despite it being way more powerful.