No really...Tecmo is interesting for a couple of reasons.
Foremost among them is the "limiting factor" of the game. Contrast Tecmo with Madden. In Madden you can never be "the best possible". The "limiting factor" of the game is the human (how fast you can press the buttons, which button combinations you use in which scenarios etc). Therefore, it's really theoretically impossible to "peak" at Madden. You can always get "better", if only by a little bit (clicking the button a tenth of a second earlier, etc...I mean, with intricacies like presure-sensitive stiff-arming and whatnot, there are just so many variables).
Now look at Tecmo: the limiting factor is the game itself. It is possible, in theory, to max out at that game. Because the game is so simple and moves slow enough, it's possible to do just about everything correctly. Take for example PRO T FLARE D. The game is simply not set up to defend that play. If it's picked, the middle reciever is open. There's nothing you can do about it. There are a couple of plays that will cover all the recievers, but even then, with an accurate QB you can still complete that play. Think about it. If you picked that play every single time, your opponent would have to pick the plays that cover all the recievers, which is, at best, a 2 out of 8 guess. And you have four downs to advance the chains. The game moves slow enough that anyone with any sort of skill can cycle to the appropriate reciever.
There's another play (I don't remember the name) that only LT can guard. There are three recievers at the bottom of the screen. LT (and only LT) is fast enough to sort of run in a circle and guard those players...sometimes.
And I haven't even gotten into the running game, for a change of pace.
My point is, in Tecmo Bowl, if you don't score EVERY TIME you have the ball (except for fumbles, which you can't do anything about) you're not any good at the game.