It would be senseless to not purchase quality players if they're available and want to come to your club - and of course, we have the funds, which we did. Are Di Maria and Falcao (and promoting Wilson, a youth player, keeping our supposed 'identity') upgrades on Welbeck, Hernandez, and Kagawa? Of course they are. Blackett has played every game so far and our two captain's are players who have been here since they were teenagers...
People will just complain because United have spent money on players in a similar vain to Chelsea, City, and Real Madrid. However, let's not forget that we earned that money in a different way to those clubs. Whether that makes huge spending any 'better' or 'fair' doesn't even matter, this is just how the game is now (if we can really call it just a game any more).