SAF is partly to blame for this. He was a great manager, but he knew he was leaving soon and he never properly brought in a new team as he had done throughout his career. A new team should have been slowly introduced and faded in over the last 3 years.
Evra is old, Ferdinand is old, Vidic is nearly finished although still great when he's playing. Rafael is fine but perhaps not quite the player we need him to be (yet).
Carrick is old but still brilliant, Fletcher has a bed reserved at the local hospital, Anderson has not been good enough for years. Giggs? brilliant player, great legend, but let's not pretend he's good enough against the top teams anymore, maybe for the last 15 minutes or in a cup game and definitely behind the scenes he's essential but we need to be able to compete against other big teams.
Van Persie is brilliant, Rooney should have left when he started acting bigger than the club but that said is a very valuable asset on and off the field. Hernandes is a great player, he needs to be used more.
Wingers, Valencia has lost his consistency but is still a great player, Nani probably deserves to play more but he is somehow even less consistent than he ever was. Young is a good player for us despite what anyone says.
We are weak in every position on the pitch with loads of old players, a few young players who are not yet ready, and very little in between.
GK we're fine. We need a LB, personally I like Buttner and Fabio and there are more essential positions to be filled.
CB, Evans isn't great but is good cover and better than people give him credit for. Ferdinand should be dropped and left to a role similar to what Giggs plays now, Vidic still has a role to fill, Jones deserves a place in the first team.
CM, Carrick and Fellaini need to be played, they are the two best midfielders we have. Definitely need another player here though.
LM Nani/Young would work fine here, nothing special except on their best day but good enough.
RM Valencia/Zaha same as above.
ST we're fine here.
I personally think a massive culling of the first team is needed. Sorry for all the waffle