Day 1 - A show that should not have been cancelled

This is not because it didn't run long enough, we got 5 seasons.
But this has everything to do with the way it ended.
It is my understanding that they had already written season 5
and they were already in the process of shooting the episodes.
And then halfway through shooting, they got the news that the
show was cancelled. And that the number of episodes was trimmed
down. But the episodes already shot obviously still had to be used.
So in the last short season we got a tonne of episodes that had
nothing to do with the core characters (which would've been fine
if they had had more time to work out those stories).
This show ended on such a disappointing note for me.
I really think that if it hadn't been cancelled, they could've had
another great season.