I have 3 Teams.
Denver was my first, in good ol' MFN 7. I made a lot of early mistakes, but made a quick turn around in Year 2. I took over what was largely a dumpster fire, in terms of W/L, but made some moves and got the team on track.
There I do All Blitz... largely because I made major Trades to acquire the Top 3 Line Backers in my 2nd Draft, all Top 10 Picks. The irony is, by 'definition', all 3 of these guys 'Busted'... all fell from their Projected Overall.
Despite this, my Defense in MFN-7 is one of the best in the business. It hinges on those 3 LBs to be sure, but I have key guys all over my Defense. I'd even put my Rotational LB and DB up against a lot of Starters.
But I paid a HUGE price... I literally sold my next Three Drafts to acquire those players overall. It could be argued that I over-paid.
Now my Defense is carrying my fledgling Offense (supported by Tight Ends to Running Backs Leon Arana and Sergio Phillips) into the Play Offs, where I've lost the last 2 Seasons to the Team that lost the Super Bowl. We're close.
I have no issue with my play style, because for me I view it as having Bruce Smith, Lawrence Taylor and Derrick Thomas from that Draft, along with Ray Lewis and Ronnie Lott at MLB and SS. I've got THAT kind of Talent on the D, and in real life if I had that kind of Talent I'd never relent and send the dogs to hunt every play.
But to balance that, I have Cleveland in MFN-73. Literally only run Zone at all times. Not a single Man Coverage in the book. I Drafted Offense in Cleveland to be Pass Happy, Throw about 80% of the time. Put up over 6K Passing two Season's ago.
Fukashima in Cust-78 is also All Blitz, but I built All Offense first for an All Run Offense. Literally not a single Pass in the Play Book, and the D is young (and lacking Talent) so Blitzing isn't doing me any favors.
Blitzing on it's own won't get you Wins. Talented Players will get you Wins. And Good Players with Better Game Planning will beat Talented Players with no Game Planning. But the bottom line is, you aren't going to Win if you don't have Talent. And if you DO have Talent, other Teams can beat you if they aren't full of Bad Players AND they take advantage of you in Scheme/Game Planning.
Some times people complain about this or that... then I look at their Team, and it simply isn't very good. I've got a Team that is only Defense with RBs that are Converted TEs (which everyone will tell you doesn't work) that is competing. I've got a Team that passed 80% of the time, and a D that only plays Zone that is competitive. I've got a Team that only Runs, and they aren't the worst Team in the League.
Point being... IF you have the Talent, just about any Strategy will Win. Until you come across a Team with comparable Talent, and a BETTER Strategy.