I'm not sure some people fully grasp the size of the task LvG faced when he walked into Old Trafford and what he is trying to achieve here.
Challenges
* United had just finished 7th(!) in the Premier League under David Moyes
* LvG inherited a side even worse than the one Moyes had at his disposal, having lost Vidic, Ferdinand, Giggs and Evra
* We had lost the core group of experienced players who had won trophies and big matches
* The squad was in decline. Almost every player we had bought in during SAF's last few seasons was inferior to one we lost
* We had failed to qualify for Europe, thus making it even more difficult to convince players to join the club
* Utd under both SAF and Moyes had tried to make the transition to a more "Continental" style of football but had failed miserably (see dismal Europa League campaign under SAF)
In short, we were in serious, serious danger of falling a long way behind the pack. City and Chelsea now have so much resource at their disposal that they are always likely to take up two of the Champions League spots, plus they can offer big wages to entice players they would previously have had no chance of signing. Gone are the days when it was between Utd and one other for the title and for the big name players, now there are 4/5 clubs just in England lining up to compete for players and trophies. That is before we even get to Europe and competing with PSG, Real, Barcelona, Bayern etc...
If LvG had failed to qualify for the Champions League last year we would have potentially been in big trouble. It takes a long time to build a dynasty but it doesn't take long to destroy one and we could have found ourselves in the wilderness for decades. Of course, LvG being the great manager and the pragmatist that he is knew that the likes of Young, Fellaini, Jones, Rafael, RVP etc....were not up to the standard required to challenge for the title so he went about making us tactically disciplined and difficult to beat. Yes it was boring at times and some of the football was painful but we need to take our medicine for the years of mis-management toward the end of SAF's career.
Now things are already looking much rosier, I think with the squad we have now we are practically nailed on for Champions League Qualification at least (sad but this should ALWAYS be the primary objective in NuFootball) and we may even pick up a Cup if we are lucky as we have shown we can beat anybody on our day. Yes we have spent a lot of money, but we clearly needed to! When you need to basically buy a whole new squad of title-winning calibre players it is going to cost you!
In short, don't be ungrateful, don't under-estimate what LvG has already done for us and be patient - we don't have some god-given right to success we have to earn it like everybody else