The only one who are deluded are those who think they are entitled to winning just because we are called "Manchester United". Standards have been dropping for years and years before LVG arrived. One can only conclude that when comparing the line-up of 07/08 with the one of five years later (12/13):
07/08:
---------------Tevez-----------------
Giggs----Rooney--------Ronaldo
-------Carrick-----Scholes-------
Evra---Vidic---Ferdinand--Brown
12/13
-----------------RVP
Young-----Rooney------Welbeck
---------Cleverly----Carrick
Evra----Vidic--Ferdinand---Rafael
In 07/08 we had Scholes, Giggs, Ronaldo, who were all world-class at the time, they were replaced by utter mediocrity: Young, Welbeck and Cleverly. Then I'm not even talking about all players that were on the decline because they were aging (Ferdinand, Vidic etc.) who were also never properly replaced.
To get an idea of the magnitude of the rebuild, let's look at the full squad Fergie left behind and ask ourselves which of these would still have the quality to be definitive first eleven starters for Manchester United at this point in time (not filling, but guaranteed starters that could make the difference).
David de Gea: Definitely
Nemanja Vidic: Nope, had tons of injuries and has quit recently.
Phil Jones: Nope, squad player at best.
Chris Smalling: Yes, important player currently
Jonny Evans: Nope, West Brom seems to be his level
Rio Ferdinand: Has quit
Michael Keane: Nope
Patrice Evra: Maybe, but not with Shaw around.
Fábio: Nope
Alexander Buttner: Hell no
Antonio Valencia: Nope, squad player at best.
Rafael: Nope, very injury prone and has only played 17 matches in ligue 1 for Lyon.
Michael Carrick: In good shape yes, but seems to perform less consistent due to aging.
Anderson: Nope
Darren Fletcher: Nope
Tom Cleverley: Nope
Paul Scholes: quit
Ryan Giggs: quit
Shinji Kagawa: Maybe, but didn't seem to be able to handle the physicality of the league.
Ashley Young: Squad player, not guaranteed starter
Wilfried Zaha: Nope
Nani: Squad player, not guaranteed starter
Wayne Rooney: Seems to have lost his edge, let's keep it to a Maybe.
Nick Powell: Nope
Joshua King: Nope
Robin van Persie: Warming the bend at Fener, seems to have aged fast, so nope
Chicharito: Doing well at Bayer, but would not be more than a squad player here.
Danny Welbeck: Nope, not more than a squad player at best
Federico Macheda: Nope.
So Ferguson pretty much left us with: De Gea and Smalling, and if I'm stretching it: Carrick and Rooney. Both Carrick and Rooney will require replacement within the next two years. That means, over the course of 3 years, 7 to 9 players in first eleven had to be replaced, just to have a decent first eleven. Then I'm not even talking about having good quality players on the bench.
As we have seen this year, buying ready-made players such as Schweinsteiger doesn't solve a lot. Most of the money you name has been invested in potential, players that will likely make a difference in the future but are not yet world class now. Martial, Shaw, Depay are all examples. Is that money wasted? No, because two out of three seem to be making it (Depay is still a question mark). Will they improve our squad on the short term? Not very much, which is why we see these results.
LVG has made mistakes and maybe he doesn't fit MU as well as many of us had hoped. But he's still a top class manager, as he proved with the Netherlands at the WC before. Maybe we should start questioning that if two managers in a row cannot get the results fans want, then maybe it's actually because our first eleven is actually not yet good enough to get those results.