Superstar didn't pose me a great deal of problems to be honest, and I'm by no means the greatest PES player around. I managed to win promotion to the top division, then win the league twice, and the league cup once, inside three seasons on Superstar, with zero passing assists and starting with default ML players.
I then got to the Champions League semi-final with some awesome games that were really tight affairs, but as I ranted a while ago, I restarted the Man City semi final four times in a row, each time getting battered by the most crazy stat boosting and bizarre goals I've ever seen. Man City as a team offered nothing whatsoever, but each time pretty much slammed three, four or even five goals past me in each time I replayed the game via bizarre goals, or Aguero doing a Maradona and dribbling through (actually through their bodies) multiple players from inside his own half. Never seen anything like it. Given each time he could pass through my defender's bodies, and, well, the game was bizarrely unplayable.
So, I dropped it down to Top Player, and man, I must have improved because it was way too easy. I went on to win the Champions League, beating PSV of all teams, 3-2 in the final, then in the beginning of season 4 I won the Super Cup on Top Player against Real Madrid, again 3-2.
From then on, with it clear that Superstar is crazily unplayable in the latter stages of the top competition, I stuck to Top Player as it was much more balanced but ultimately too easy, and so unfortunately my ML just petered out after that. I ended up winning every game by huge margins (I beat Sporting 7-1 in the league, then my Champions League group game against Schalke saw me win away from home 8-1!!).
After that, I ended up skipping the league games and got further in the Champions League, but at the end of the day I wound up being bored just playing CL and quit my game during the fourth season. Enough ML for me I think now.
It's been a great game all in all, but ultimately Konami's inability to provide a proper, fair challenge has seen me give up on the game. I'll still play the odd little cup here and there, but I hated how much better everyone got in ML. It ended, only in season 4, with average Premier League players rated at 90+. That ain't right. But the fact that Top Player became so easy in the end, and Superstar was also pretty easy overall (with me winning the league twice by over 10pts each season, scoring goals for fun) but then completely turning on the play in the latter stages of the CL saw me with no real point anymore in playing it. Once I found myself scoring a goal and no longer being excited by it, I thought it was time to stop.
Ah well, I got my money's worth, I've been playing Far Cry 3 and though it's fantastic and blows PES out of the water in terms of how to make a current gen game, the irony is that I'll still have racked up so many more hours out of PES than I ever will with Far Cry.