Lets face it, the minimum expectation now is to win the league this season. I know a lot of people here do not want to acknowledge it but you can see the hidden aspirations behind the frustrations. I mean:
1) Losing 3-0 against Arsenal is unacceptable;
2) Dominating City but letting them get away with a draw is not deemed not good enough;
3) 0-0 draw with Palace is deemed not good enough (where Liv had just lost

);
4) winning 2-0 against West Brom is begrudgingly acceptable.
but if we managed to draw against arsenal, spanked city, get a 1-0 win against palace and wipe the floor with west brom, we will be comfortably top of the league. That is what United fan want and screaming for.
So in conclusion, the minimum expectation is for Van Gaal to win the title this year. Anything less and he should go. We should not kid ourselves that we are happy with a "title challenge". We are afterall, Manchester united. Once we accept this, then the whinging will make more sense.