My experience of social services is that they are useless. Sorry. I'm sure there are lovely social workers but ime they are totally ineffective. I barely bother to complain about anything these days but have already sent one written complaint about SS this year and am gearing up for the next one (separate issues).
The social services department I have contact with is a zero starred one (or maybe it has one now), so it has been assessed as crap and my experience is that it is.
Social workers won't get acknowledgement for good work when whatever it is they are doing doesn't result in any help for families who need their services. Or when their system actually makes things harder for the families trying to get help.
However in my complaint I did make sure that I stated that the OT and the social work assistant had both been helpful and supportive.