I don't think United were ever going to solve all their problems in one transfer window. People should remember that. I think it might take another 2/3 transfer windows with some more people coming in and out to get the squad Van Gaal wants. So the criticism of United didn't strengthen in this area or they need to improve in this area is unfair really - they were never going to get it all in one window.
I have to laugh at people saying Di Maria and Falcao are panic buys. Panic buys! These are two of the very best footballers in the world. They are outstanding players. United needed quality - they have signed quality. United have reacted to the market. Di Maria became available - of course United were in for him. Falcao has become available - of course United were in for him. There squad looks a hell of a lot more stronger with them than without them.
As for where they will all play? Another silly question. Injuries, suspensions, squad rotation - you need that quality right throughout your squad if you want to win the title. Look at the number of players Liverpool have brought in for example. If you look at the bench of a side like Man City or Chelsea - there benches are ridiculously strong. Class all across their squad. United haven't had that and have sought to address that.
Luke Shaw and Marcos Rojo look astute buys - if a little expensive. Daley Blind looks a very smart signing for Van Gaal's system he is employing. Van Persie needs an operation at some point and bringing in Falcao covers that. United now have the best 3 strikers in the Premier League. Di Maria injects some pace and the ability to bloody beat a man that has been missing.
I expect United to make the top four. Dwight Yorke believes they can win the title. The quality is definitely there now. They need to start picking up points fast though and a good January transfer window is needed. Interesting times ahead.