That highlights a midfield problem that needs addressing.
Ergo, we need some improvement in the midfield.
Also true, but realistically most big teams now play a 4-5-1 or 4-3-3 of some sort. Very few will play with two out-and-out strikers, because the battle for midfield is so important, and even the best CMs in a 4-4-2 are unlikely to be able to match up against a 3-man midfield.
I can see Berbatov playing well as a lone striker for a team like Arsenal, who like to play possession football, keep passing it around and unlock the opponents. We play at a much faster tempo, and need our striker to be in goalscoring positions.
If we are to have a striker who drops deep (like Rooney used to do on a more regular basis) they need to have the energy and workrate to get forward again and make themselves available in or around the opponents penalty area. Berbatov simply doesnt do this - he will drop deep and stay deep, maybe walking back up normally behind the midfielders.
Perhaps if we had fit, first choice midfielders with lots of energy who could attack the box and score some goals themselves - but our CMs dont tend to do this (Fletcher has the energy but isnt really a goal threat, ditto Anderson), they are playmakers. Result is that we dont have any real goal threat - and this has been highlighted when Rooney hasnt played.
Personally, I wouldnt be opposed to simply sticking Berbatov in midfield alongside Carrick and Fletcher. To use FM terms - Carrick would be the deep lying playmaker, Fletcher the box-to-box and Berbatov the advanced playmaker. That in a 4-5-1 with Rooney up top would be a viable formation for me at least.
The issue remains however, we are reliant on Rooney. We need another striker who we can trust to get some goals and provide a genuine goal threat consistently from game to game. Macheda, Owen and Hernandez will hopefully be able to deputize for Rooney next season in this sense.