It all depends on what style the team plays. If they play a way that is free flowing and focused on attack. It can work.
Look at the Florida Panthers defense. After Ekblad went down, they were playing Yandle, Forsling, Montour, Stralman(this is the old stralman), Gudas, Weegar. None of them I would say are very good defensively. Nutivaara they added who is solid.
Its not like the canucks were good defensively in the last few years. We were bot 5 all these years. Only really good defender we had was Tanev, and we let him go.