IMHO, the O-line is the most important part of a football team, bar none. Skill players can be bought and sold, save for a few special talents. Blocking and protection is the name of the game...
I agree 100%.
It's especially important in the NFL, but all through every level in football, right down to Junior High, the better the line, the better the team. There are a few exceptions here and there, but that's a general rule to build on.