Mine is very playable. Sometimes I don't like the built in game design so I find a way around it or turn it off if possible or play in another way, but I don't call it a bug if it's working as intended but I don't like it. Some bugs and glitches I see currently aren't crippling to my game play because I treat them the same. I think it helps that I can play in multiple ways though as a work around so I don't spend a lot of time upset. I don't have any of the bugs that would possibly shut my gameplay down that others are reporting right now.
I'm not currently using mods at all though and for me the ones that really mess up my saves happen when I'm using mods for fun.. especially multiple mods.
I do notice overpopulation beyond the suggested amount makes my saves start to lag and slow so .. I'm pretty careful with culling the population myself and limiting playable households per save.