This question is definitely going to need some expanding upon. I can tell you that you have a lot of options here, unfortunately your biggest limitation is that this doesn't appear to be time series data, or maybe that field is just omitted on accident from your example. Can you make sure I am understanding your data correctly?
user - this field is pretty straight forward, it's a user.
unit - is this some sort of business unit? like a team they are a part of?
work - is this hours worked?
If that's the case, you could show
- a pie chart of users
- a bar chart with which users worked x amount of time
- a bar chart of average amount of time worked by team
- a bubble chart showing users that worked x amount of time and then the bubble could be the size of their team.
Of course you also have gauges, marker gauges, etc.
