Home field advantage in a dome in the playoffs is worth at least 4 points. If anybody disagrees, please say so.
The reason New Orleans played bad at the end of the season was injuries. Most of the guys healed and it showed vs. the Cardinals. Minnesota is a solid team. There weakness is their pass defense ranking 22nd in the league.
New Orleans is a better team and their dome gives them 4+ points so I see New Orleans covering at -4. I expect some line movement so I would hit this early.