The discussion started on this thread, moved to the
Roy Keane Myths thread and is now relevant here again!...
Since it doesn't seem like we disagree much on the other points, I will only address the last part of your post. It is hard to make a bullet proof argument about our football in those last years under Fergie as one's exciting football is not everyone else's. I would however argue that there was a general consensus on this board among other that our football was hardly comparable to the best teams in Europe or even the likes of Dortmund or City in that period. The transfer of Kagawa I remember generated so much buzz because people were hoping he will change that to no avail of course. I would also cite our performances against the likes of City, Chelsea, Real and Liverpool or even the likes of Bilbao where all we did is sit back behind the ball losing the midfield and being pressed all over the pitch relying on the individual brilliance of Van Persie, Scholes or Rooney. I don't know about you but that's not what I'd call performances befitting one of the biggest clubs in the world. Against the rest of the league, our games were either ones where we got our noses up front and sat back behind the ball to defend a lead or ones where we did not defend well and ended up throwing the kitchen sink which albeit being exciting and enthralling, is still indicative that we were very flawed.
After Fergie, the only relatively modern manager we had is LvG and his tenure was overall a disappointment. That however doesn't mean that a more coaching/tactical oriented approach does not work. A quick glimpse at the best teams in the world would tell you that. We sadly don't exist in our own little island where we play by our own rules. We have to adapt to the modern order whether we like it or not because everybody else is. You seem to equate the failure of individuals with the failure of a system which I think is a very common attitude. People don't like someone's coaching, rightfully and then go on to write off everything he did from his performance, principles and ideas. My point is that just because LvG failed in the end, not everything he stood for or believe in is wrong.
We had to adapt to the modern order... because... 1st, 1st, 1st, 2nd, 1st, 2nd, 1st in Ferguson's last seven seasons wasn't good enough? Notwithstanding Ferguson's retirement, I'm not sure the system or results were something that really needed fixing, and I don't see an advantage in the 7th, 4th, 5th and, currently, 7th positions that change has brought.
I think it is fine to equate the failure of individuals with failure of the system - that includes formation, tactics, training, mentality, everything. It's a whole topic in itself, but perhaps some systems are not suited to some players or some clubs (without the drastic overhaul to go with it that still doesn't necessarily end in success). At the end of the day the best system is one which gets the most from the players, entertains most if not all supporters and gets results.
Ferguson's system by and large achieved all that at United and I would be happy to see it continued. I think perhaps you are selecting isolated performances and results which do not reflect our seasons as a whole to counter that – you know, we can't win them all.
I mean Bilbao, sure we were not at our best, and they were an in-form team at the time, went all the way to the final (incidentally that was the season Keane criticised our Champions League exit to Basel prompting the 'feud' with Ferguson to ignite in public). Yet the next season, still under Ferguson's system, we bounced back to win our first four Champions League group games to progress and looked favourites against Ronaldo's Real Madrid before we went down to ten men and subsequently conceded a freak two goals in three minutes.
However, in the same season we lost to Bilbao, we beat all of City, Chelsea and Liverpool along with results like 3-0 vs Tottenham, 8-2 vs Arsenal, 5-0 vs Fulham, 5-0 vs Wigan, 5-0 vs Wolves. And similar in Ferguson's final season where again we beat City, Chelsea and Liverpool along with scoring 3+ goals in 16 out of our 38 Premier League games.
So I'm not having it that our standard was not 'befitting one of the biggest clubs in the world'. If you really think that, then, no offence intended, but apart from it being a little bit spoilt, maybe it's like Ferguson would say, “Sometimes you look in a field and you see a cow and you think it's a better cow than the one you've got in your own field. It's a fact. Right? And it never really works out that way.”
So it seems Fergie, so it seems.