I agree with most of the points your making but just for discussion I will be the Devil's Advocate to your views.
First to your question to anyone reading. Yes a good offense can beat a good defense. But I think that falls into the saying that you ignored throughout your whole post - ON ANY GIVEN SUNDAY ANY TEAM CAN BEAT ANY OTHER TEAM.
My point there is that you can't base a whole offense vs defense debate on one game. Since we can't replay real life over and over to see how many times the colt's would have won or lost, you need to go by historical data. And the data will show that a good defense will beat a good offense the majority of times.
I am a believer in the "Defense wins Champions" mindset. However, I do acknowledge that a great offense is a valid route to build to in today's NFL. I think that it has more to do with the rules that have changed that is making it this way though, and not because offenses have become that much better. Heck even the kickoff has been changed to allow offenses more scoring opportunities.
Anyway, just looking at it from a different view.
I do see your point on other things though and agree that some teams get predetermined outcomes. But IMO it has more to do with the ratings they give the players. Like If you take an 80 ovr rated QB and give him a pair of 99 rated WRs, the QB is going to have stats that are going to make him look better than he is. This gets interpreted in Madden to a 99 QB on the same team with 2 99 WRS. Which makes it even worse.
I think that is the problem you are seeing with your example of Blitzburg and the great Dime defense. The Great front 7 make the other 4 look better than they are. So in Madden they get ratings that are probably not what they should be. Maybe. But at the same time, how could anyone know how good Steve Young would have been without Jerry Rice and Terrel Owens. Did they make him better?, Did he make them Better? If they both made each other better then that is my point. None of them were really as good as their stats showed, they were getting the luxury of playing with good players that helped them look better.
Nice to see your thoughts though. Looking forward to Part 3