If I had to give this hero a score it would be an A, possibly even an A+.
I included him in a beorning deck for fun and thematic purposes, and boy was he fun. I underestimated him at first thinking that he would be a fun gimmick, but not as good as his younger self, and I was proven to be dead wrong. I would put him on par with his other version if not better. That's saying something considering I like the other hero Beorn a lot.
For one thing, he has sentinel which is great for me because I only play on multiplayer so I can support weaker combat decks.
His ability is reeaaaallllllllyyyyy good! I was so impressed at how many times I found myself using it. It is basically built in action advantage with a bonus that he reduces the enemies by 2, effectively giving him a boost in attack power.
His stats are also all in the right place so he functions effectively as a defender AND attacker.
I can see that Fantasy Flight designed him to help the player with combat for the early rounds before your deck gets set up. I wonder if you're allowed to make a deck with Grimbeorn the Old and Beorn? That would be fun!
Good designing Fantasy Flight! You guys have my approval.