Enjoying it solo. Worth the price just for deer hunting and sailing. Both awesome simulations. Tip: hunt upwind, as deer can smell you coming if they're downwind of you.
I have always thought I didn't have the reflexes to do the fancy moves like parry, block, dodge, etc. But I am having to learn them in this game, and doing better than I expected. As the Martial Arts masters say, the best way to block an attack is not to be there when it lands. And when that attack is coming in from something big and nasty, the dodge is your best friend.
One last tip: There is no skill tree; the more you do an activity, the more you level up. So run and jump and sneak a lot. When traveling long distances, I use "Scout's pace": run until your stamina is at 50%, then walk until it recovers. Jump over things in your way.