It is an appropriate use of the word "cancer" in the sense that it's a common figure of speech, but I agree, it's not a word I like to see very often in any context.
The thing with the pressure... Konami spend all this time working on stuff for "one-on-one situations" - there ARE no one-on-one situations in PES2011, only four-on-one. I remember before the patch, you did get one-on-ones offline, where you and the defender could stand still facing each other - you'd do a stepover and slip away, looked great and was brilliant fun. Unfortunately, because the way it was coded was fairly primitive (the CPU defence stood off you when you weren't running) it led to the "green zone bug". So of course, Konami patched it in a hurry and their only solution was to bring in massed 100mph pressure in the opposition half. Didn't quite ruin the game, especially as AI pressure was perhaps a bit loose before that, but it made it much more frustrating and less realistic.
Online it's obviously much worse (even in PEEL a lot of people defend like that) because it's easy and there's no punishment. Personally I hate doing it - I have compactness set to wide and pressing low, spread my defence out and track players individually - but I'm not rewarded for that by the game, quite the opposite. If I just held down X and square all the time and didn't even look at the screen, I'm sure my players would do a better job of snuffing out attacks. If you just do that all the time, and when you win the ball back immediately hit a long through ball, play a one-two with the receiving player and then another through ball in on goal, you'll win far more games than you lose. PES gives you all this amazing freedom to do great stuff on the ball, then leaves in nooby tactics which totally snuff that out and hand the advantage to anyone who's prepared to play cheaply (even on Top Player). So - surprise surprise, almost everyone does. The fact that they've brought in all this new one-on-one stuff, but there hasn't been a word about pressure or stamina changes, makes me wonder if Konami even realise this is a problem. If nothing's changed with the pressing situation, the stuff they announced so proudly in yesterday's video may as well not be there.
Anyway, the point is, I'm not sure that just tweaking the stamina system would fix this. Because if you look closely you'll see that pressing is not affected by low stamina. Even when the team are all exhausted, they can still sprint-press until the final whistle... what's affected is stuff like ball control. So as the game goes on and the players get tired (with the team who've played at walking pace just as tired as the team who've sprint-pressed for 90 minutes), the pressure noobs actually find their advantage increased, because the man with the ball being pressed by 4 robots will find it harder and harder to escape the press.
The only way to change this is to alter second (and third, and fourth, and fifth) player pressure so that only two or at the very most three players respond to it. At the moment you hold down square and before the man on the ball has time to turn his body, there are four men standing round him in a circle, leaving him absolutely no options. What you want is for two men to press him, maybe with a third standing off, so a skilful player can turn or pass his way out through the gap. You also need teammates to run into the space left by those pressing defenders, to receive the ball (at the moment the gaps left by mass-pressing don't mean a thing because your teammates are too dumb to exploit them - often you'll be surrounded by defenders and your nearest teammate is 20 yards away, being marked). Then you need a proper stamina system which means that in the last 25 minutes of the game the pressing team are completely shattered, press much less strongly, and run more slowly than the team who've spent the game dominating possession, making it far more likely that they'll ship goals. You also need a ref who understands that running into a player's back without touching the ball, so he stumbles and allows you to take possession, is a FUCKING FOUL.
We're supposed to be getting the second of these things in PES2012, there's a small chance we'll get the third and fourth. Will we get the first? I doubt it, but you never know. Point is, Konami need to look at this seriously and not just plaster on a quick fix... if indeed they're aware that it's a problem in the first place.