You certainly should be scoring more goals, but your attack certainly has excuses too.
Adnan looks exhausted and in well need of a rest, someone that young should not be relied on that much. RvP and Rooney look as if they are on different wave lengths - Rooney is a shadow of his former self in that playmaking role and RvP looks like he doesn't want to be there. Mata doesn't seem to have the impact he does on the wings that he does in the middle.
Moyes' inclination to be so offensive midned yesterday ultimately played into Rodgers' tactics. Mata and Adnans lack of tracking back allowed us to control the flanks as well as the middle yesterday. Moyes is the reason for a lot of whats wrong at United, but the lack of discplined players in training will only make matters worse.
Januzaj has only started 3 games since January 22. I don't think he needs a rest at all. His performances, well his 3 games he started, have looked ordinary because Moyes has played him primarily on the left. He also hasn't impressed much lately because he simply hasn't played enough. Finally, he's only being relied on that much because the attack just doesn't have any creativity which comes from Moyes.
Every attacker looks shit under Moyes. Moyes takes the blame for that. Kagawa looks good with Japan out on the left due to the style of play Japan plays. Mata played on the left for his whole career besides last season and obviously did well there. RVP looks shit because he isn't getting involved like he usually does and Rooney likes to occupy his space. For all this talk (media) that Rooney is doing great this season he's only at 13 goals all season (31 matches). Everyone says he was shit last season and he finished the season with 16 goals in 37 matches.
Everyone is suffering under the ginger goblin. That is due to a number of reasons. His trainings and tactics must be so shit, because it doesn't matter what line up he puts out there, the team is just inept at attacking. His team selection hasn't helped him either.
If he sees the players not moving around a lot, he should work on that in training. If he sees the players aren't comfortable in possession, he should work on that in training. It seems like he's doing nothing to help the attack which is what United have always been about.