Preferred the stock UI of Kbin, then I found out about userstyles and am in love with them. I'm a big fan of the microblogging, as it's a place for posts that don't warrant a full thread, but can still spark discussion. The politics of the Lemmy devs disgust me, so I'd rather not use a site using their software. Public upvotes/downvotes are great IMO, lets things be more transparent (like for instance I upvote all my posts, without it being public no one would know), plus it helps catch fake votes.
I also just find the name Kbin to be more catchy than Lemmy. Like GabeN, or k than.
Even then with AAA multiplayer, it's not a guarantee it's unplayable. Every Halo game on Steam works just fine, and Apex Legends was one of the first AAA MP games to support the Deck.
If you're on console, Black Ops 2. The maps aren't my favourite, but IMO the core zombies experience was perfected and it's been all downhill since. Polished experience with a solid gun roster and nice difficulty. Plus there's maps for nearly every skill level. Just wish there was more than just Nuketown and the sub-Tranzits for those of us who want a pure survival experience.
If you're on PC, WaW or BO3. WaW hss a massive back catalogue of custom maps, plus is one of the few CoD games that's reasonably priced on Steam. BO3 requires you to pay a lot more, but is a much easier source of playing modded zombies. This is just my opinion, but I'm not a big fan of unmodded BO3, guns are uninspired and feel awful, and gobblegums are a fuck that never should've been added. And then objectively, WaW is super buggy, and has a fit if you alt tab, but, subjectively, the simpler custom maps (not to say they can't be complex, Leviathan was a WaW custom map) give off a nostalgic vibe.