Blind - Think he's excellent when playing as DM. As LB/LWB his attacking play lets him down.
Shaw - He's excellent as a LB, defensively sound. But his attacking play simply isn't there (but this was the same issue at Southampton).
Herrera - He makes us tick, not sure why he isn't playing much.
Di Maria - Being played all over the place, needs to go back to his Real Madrid starting position before we start to see him recovering his form.
Falaco - No service, has missed a few chances he should have put away.
Rojo - Thought he was going to be an awful signing, but he reminds me of a young Vidic. He'll be a brilliant CB for us imo.
But if we look at the above, then look at our choices for wide players you'll then see the issue:
- Blind (not good as a LWB)
- Shaw (his attacking play isn't good enough)
- Valencia (he's awful)
- Young (he's our best wide player which says it all)
- Rafael (injured)
- Di Maria (can't play as a WB)
So you now understand the issue we have. I think LvG probably regrets not buying in a new RWB, but we don't know his long term goal at United. He may see 3-5-2 as a short term answer to get us into the top 4 before being able to change formation by bringing in the players he wants. Being out of the CL hurt our Summer spending imo, being in the CL is very important to bring in the top quality signings. I just think we need to realise that this season is a work in progress and accept that we won't be seeing vintage United. If we're still playing the same way next Season then I think Van Gaal can have criticism thrown his way, but i'm being realistic and trying to appreciate that at the end of the day finishing top 4 is far more important than playing good football. As long as we finish top 4, Van Gaal has my backing, if we fail and we still play terrible football next season, then i'll be growing hugely frustrated.
I think that a neutral would have judged more like this:
Blind - very good as defensive midfielder
Shaw - overpayed kid who at best should be second choice at a club like United. Also, in modern football, a full back should be good attacking-wise too.
Falcao - crap so far
Di Maria - great in the first 5 games, crap since
Rojo - average
Herrera - not on the first team, despite that United are weak in midfield.
Now, I agree with many parts of your post. I think that Shaw can eventually become one of the top left backs in the world. Di Maria is an excellent player and Herrera is a great player too. At-least these four should - on theory - be very good signings for us. Also, there is still hope for Falcao and Rojo might turn out to be a great defender.
What I am saying though, is that so far they haven't been good (with the exception of Bling and Herrera on the rare occassions he played). On the right infrastructure, they should shine. For whatever reasons that isn't happening.
Anyway, all is forgiven if we go back to UCL (and hopefully we'll improve next season). But if we don't manage that, then LVG should not have any complain if he gets sacked. He was backed in transfer market more than any other United manager, and if his signings haven't worked (for any reasons and regardless of their supposed brilliance) then ultimatelly it is his fault.
Saying that, I think that we should be able to achieve our target (UCL) as long as LGV becomes more flexible and tries more risky tactics rather than keeping the ball forever and do nothing with it. Will he adapt though, is the 50m (if not more) pounds question.