I'd say it depends on the purpose for the grind.
Valheim starts off well, but it swiftly turns into that "I'm grinding materials so I can build tools, those tools I can use to grind materials which I need to build tools so I can grind other materials."
There's little extra hook to actually get into it beyond that cycle. I mean, sure those boss fights are there, which you need to go through to unlock access to higher level materials / tools in which you need to... grind for materials to build tools to grind for materials...
I think I need a bit more story or world engagement to stick with it for anything other than a social hangout with friends.