Various things have inhibited us this season at different points, many of them the manager's doing I believe.
The real elephant at the moment is that not one of our strikers is good enough anymore. The 'sharp end' of our team simply isn't very sharp at all. We were unfortunate to lose to Swansea on saturday as we dominated, but ultimately, we offered little more than slowly passing from side-to-side to work a full-back into a crossing position. Persie's radar was off, although he was at least being a 'striker' in terms of trying to work the keeper and get shots off. That said, the fact that none of them can run past a man, with or without the ball, or even dribble past defenders is a huge hinderance to the team. It has an effect on all the midfielders behind them too.
On saturday, Rooney did nothing 'wrong', but he put in the performance of a central midfielder playing centre-forward almost. He offered nothing different to Herrera 10 yards behind him. It was all receive it into feet, play a short pass, get it back, play another short pass, pass it out wide rinse and repeat. It wasn't wrong, but it was all too blunt. It was like watching Tom Cleverley play centre-forward.
I wouldn't be sad if none of the three were in the first XI next season, although we appear to be contractually bound to Rooney and emotionally bound to Persie. Centre-halves are too comfortable playing against our strikers as our forwards don't move them around enough or make life uncomfortable. I don't think they have enough to start as strikers for elite sides anymore, unless perhaps that side had insane goal threat from wide and they were simply relied upon to be 'goal-hangers' and just finish. They can no longer do nearly enough on their own, and defenders know it and are not rattled. If they were stretching defenders the likes of Di Maria and Herrera would be an increased threat from deeper.