This series suffered heavily from the loss of Rebecca as GM. Alone, she wasn't that strong a character, but she and Charlie worked very well together and had undeniable chemistry. Add to this the fact that promoting Charlie to manager was a very poor decision character-wise. He worked exceptionally well as the put-upon deputy who struggled between being 'mates' with the staff and being management. Bringing in another manager would have been preferable, as so much of Charlie's character was sacrificed / toned down to suit the role.
An additional blow for the show came with Charlie's own departure, clearly planned from the outset as the dulcet tones of Max Beesley were replaced by various cast members doing the show's 'narrative' (making the series take on quite a different tone from the start).
The comedy elements seem to be few and far between this series as well, and it stood great danger of falling into the trap of taking itself too seriously.
Although it remained a very watchable, light-hearted drama, series 3 seemed to have lost much of the charm of the first two series.