Those "idiot announcers" don't dictate what I see with my own eyes. Go watch the AFC Championship Game and tell me that Hampton isn't getting double-teamed on almost half the plays he is in.
The Center is responsible for the NT, but generally is aided with the NT until the "blitzing" LB is known which is then picked up (hopefully).
In the Steeler's scheme for example, the MLB is simply the 4th rusher and is what causes the problems for the opposing Offensive Lines.
The "blitz" generally comes from the extraordinary OLB's in the Steelers scheme which force the Tackles or HB to pick up either Woodley or Harrison. The problem with the 3-4 is trying to figure out where the blitz is coming from. Generally rushing 5 for the Steelers in real life gets a decent rush on the QB from either the Mike or Mack LB or OLB, rarely from the DE.
However, with the NT being picked up in the A gap individually by the C in Madden it leaves the Mack or Mike to easily get stoned by a Guard and the OLB getting stoned by a Tackle or FB/HB. I have had 3 sacks in one game by my DL and only 2 from my OLB's. I am not arguing that I should have had more TOTAL, just that the numbers at best should been INVERTED.
The bigger problem comes when you are defending the run and people can run up the middle easily when your elite NT is pushed off the Line by the Center alone. Highly unrealistic and leaves your D at a loss when these power backs can easily get to the second level and create plays. It also creates huge problems when you have a team who has a Power RB and a decent or good pass catching FB. You have to pick your poison because you have to commit extra people to stop the run which leaves the flats or the area behind the ILB's wide open.