I do fully understand that social workers are often overworked so wanted to check to see if our experience is normal before escalating anything, and risk seeming precious/difficult.
Our social worker has always been a bit iffy, after my first call with him I was uneasy but after our first video call my concerns diminished a bit (to the point where I was a bit perplexed but not concerned enough to ask for a new SW - which I was prepared to do if the video call had gone as badly as the initial telephone call had)
These are my biggest concerns -
In our last couple of meetings he constantly forgets my husbands name and not just confusing it with a similar sounding name it's very different (as in for example DH name is John and SW keeps calling him Nigel despite being corrected every damn time)
We are in stage one and completed our homework and all references within one week of starting, but in our week 4 meeting he said he hadn't seen anything come through (when it had been confirmed by their administrator in 2 separate emails to him prior all references had been complete)
He said he was still waiting for a reference from our daughters school - we have no children and therefore he was clearly mixing us up with another couple
Our week 4 meeting was a total shambles. He was over 35 minutes late with no attempt to even contact us to say he was running behind. And he spent the whole time just talking to himself about what was complete and what wasn't.
He hadn't even looked at any of our homework which had been completed and sent over 3 weeks prior and he confirmed receipt at the time - but forgot about that of course 
I'm just worried this kind of behaviour/attitude will cause issues down the line, but if it's common I won't cause too much of a stink (I have already told him that the week 4 meeting wasn't ideal and want clarification and an agenda for our week 7 meeting to avoid the same happening again)