@prarek tagging you since this is also somewhat in response to your post.
^This... I completely agree with.
@Walrus picking Mata out of our team against Chelsea and casting stones seems petty.
I mean the whole attacking quintet struggled. Did Young play well? Fellaini? Rooney? Falcao? ADM when he came on? How about Januzaj? We struggled against an very organized and determined Chelsea who will most likely win the EPL.
Based on your definition of luxury player who on United is not a luxury player?
You and I clearly have very different definitions of a luxury player, or you have simply misunderstood mine.
A player playing badly =/= a luxury player.
Lets take a quick trip through history and look at how formations have changed and evolved over the years. Without spending pages and pages on it, the basic trend is that as time has gone on, teams have tended to field fewer and fewer strikers, in favour of more midfielders who can impact all phases of play.
We have even seen the likes of Barca and Spain using systems with no striker at all, with varying degrees of success.
The reason in my eyes is pretty simple - an out and out striker is someone who generally the team must carry for most of the game. He isnt expected to defend a lot (although the recent trend of high pressing is something the striker can participate in), and often can simply act as a poacher. Of course there are other types of striker who get more involved (like Rooney), and typically those players tend to be the more successful ones at the moment - Suarez, Rooney, Messi etc. It is often said that the time of the #9 is going/gone.
So teams stack the midfield, to have more players who can contribute in all phases of play. Again, a lot of the most successful attacking midfielders in the PL of recent years have been the ones who still work hard and put a shift in, whilst also offering a lot going forwards.
Now back to luxury players - a luxury player is someone who typically does not contribute much except for in the final third or attacking situations. They - as with a striker - need to be carried by the team to an extent, in the hope that they can provide something. If the team is playing poorly they will often be anonymous, but when the team is playing well they can be the icing on the cake.
Rooney is not a luxury player, nor is Young, nor is Fellaini - these are all players who will put a shift in, and whilst they can still have bad games, will inevitably contribute in some way shape or form. The likes of Mata however, can very easily play 90 minutes without contributing anything of note, because he is quite a limited player in respect to what he actually brings to the team;
Young - Good pace, good defensive contribution, decent crossing, can also cut inside and shoot.
Fellaini - Chest control and general strength/holdup play making him a great outball for defenders. Also a guaranteed threat on set pieces/corners, and valuable in defending the same.
Rooney - Definition is a bit stretched here as Rooney is a striker not a midfielder, but he is a very versatile, complete player.
As for Mata - he isnt fast, he isnt particularly strong, he doesnt have the sort of workrate of a Rooney or Hazard and offers little defensively. In short, all he brings to the table are his technical attacking qualities - linking up, playing through balls and being a good finisher. Its a very limited skillset somewhat like Valencia, in that he is very good at what he does, but "what he does" is limited to a few things.
I imagine this comes across as me calling Mata crap, which I am not, and I dont think of him. In the exchange I had with
@prarek last week after the City game I summed up my thoughts on Mata and his contributions. He is a good player and it is made more prominent by the fact that he seems such a likeable, nice bloke, however I dont think he will ever reach the sort of levels that the top PL players of recent years like Hazard, Silva or Suarez, until he is able to either expand his skillset or start impacting games consistently and "taking them by the scruff of their neck" to use the cliché.