Here's the advantages and disadvantages....
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Advantage of the 3-4 Defense
The main advantage of the 3-4 defense is its linebackers and canopy effect they give to the line of scrimmage. Based 5 yards back from the play, linebackers can read the flow of the play and give pursuit. The defensive lineman are really there to take up blockers and clog the running lanes leaving the linebackers free to make the play.
The 3-4 defense also can confuse offenses as at different times a different linebacker can be lined up on the line of scrimmage to rush the passer. A number of blitz packages are also available to defensive coordinators as blitzes can come from any of the eight spots on in the defensive backfield.
Disadvantages of the 3-4 Defense
The 3-4 defense really is a personnel-based defense. If a team does not have the linebackers who have the speed and size needed or defensive linemen who cannot take up blockers , the 3-4 is very vulnerable. The result of these situations is teams playing a base 3-4 but through most of the game actually running a 4-3 defense with a linebacker used as the fourth down lineman.
The 3-4 defense is also susceptible to the inside rush. With just a nose guard to plug the middle, the inside rushing game many NFL teams use as a base offensive play. Teams running the 3-4 defense need to have a nose guard that can occupy 2 to 3 players on every down to free up the middle linebackers. In the league right now, finding a true nose guard like that is difficult because of the emphasis on speed play in the college ranks is producing fewer large bodies to be run stoppers.
Read more at Suite101: The Basics of the 3-4 Defense In Football: NFL Teams Are Moving to the Base Defense Because of Recent Success The Basics of the 3-4 Defense In Football: NFL Teams Are Moving to the Base Defense Because of Recent Success
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Otherwise, our HC wants to impliment it. nough said.