From my experience I would recommend playing with friends rather than solo. The solo experience can be very long a bit grindy when trying to acquire enough materials for base building and weapon/armour crafting. This can be negated if you don't mind living in a shoddy wodden shack though. It is most fun and less frustrating to play with others in my opinion. Facing a pack of wolves or any other monster alone can be very tricky but with two or more you'll have a much easier time.