You at least want someone who is good/good. Ideally, a player who is great/good, very good/good, good/great, good/very good is the best possible outcome.
You have to be extremely gifted offensively if you are bad defensively to stay in the league, especially at D. Plenty of offensively minded D over the year have had a hard time getting a contract unless they are offensive wizards.
Tons of very good/bad players are AHL lifers as well.