Despite the fact that Kagawa is undoubtedly a very good player, the question to be asked is whether United need a player like him to improve the team. Kagawa is primarily an attacker and United isn't really short of attacking options with the likes of Rooney, Welbeck, Chicarito, Young, Valencia and Nani. The area where United really need to improve is the middle of the field. Enforcers and playmakers are needed there to replace the lightweights and ageing players like Carrick, Giggs, Scholes.
That was exactly the point I've made in the other Kagawa thread started stefan.
The funny thing is manUre don't really need the energy Kagawa will without a doubt now bring to the squad as they already have that in abundance. Definately not the signing manUre need nor an improvement to their squad.