Joab did bad, bad and more bad. I've always wondered why he was a Hero and Abner was an Evil Character.
I guess because Joab was with David (A 'Good' King) While Abner sided against David. Doesn't make sense to me. I used to think Joab was cool (when I got my first joab promo...way long ago) but the more I learned about him... He really was one of those "Who needs enemies when you have friends like that?" sorta guy.