Not my words, but I share the concern.
The Guardian's football writers I think describe the situation well enough:
Yep. Beattie, Bent, AJ, Yak, Jela...even Rooney's second season under Moyes was less goalscoring.There is a long list of strikers signed by David Moyes who have excelled for a season or so only to begin running the channels and chasing down throw-ins and then slump to mediocrity soon after.
See point 10 here
What's the answer? More attack-minded coaches in the setup? We've had Sheedy and Dunc, tho' I wouldn't mind asking Cottee if he fancies a job as the striker's coach at our club. He wasn't one for running channels, but he was one for consistently scoring goals with instinctive finishing. Maybe our strikers need some of that instilled into them (and maybe Moyes needs to understand that a goalscrounger can ultimately be a stronger defence than a tracking-back striker).