I really wanted to like Bilbo, but I just can't get over the fact that his starting threat is so high compared to his stats. Maybe they figured they had to raise his threat for an extra 3 points, because his ability doesn't require him to exhaust. I don't know. With all the other heroes it is very transparent (willpower+attack+defense+hipoints) , but for Bilbo they changed their formula. I don't think that it was a mistake...
Usually I take a flavorful card that maybe isn't the most powerful in the game anyday... But Bilbo hasn't convinced me yet. But who knows? Maybe I'm just freaked out but the massive wig he's wearing in the picture ;-)
Boromir will see some playtime - that I know already! Sure, his second ability is nothing you want to use very often, but imho his first ability alone is powerful enough to include him in a deck or two!