As others have said, one star is over-generous.
The biggest problem with this cinema is the staff. Not that it lacks them - far from it, there are frequently groups of staff, standing around chatting. Usually while the queues at the handful of open tills snake all round the lobby, as you risk missing the start of your film.
I presume it is a badly paid job, as very few employees seem to have any enjoyment, and there is no evidence of any customer service training. I only remember one occasion when a ticket seller made any attempt at human interaction, and there is just one guy, who generally takes the tickets, who always says "enjoy your film"...
The screens themselves are, as stated, for the most part dirty, sticky and littered.
The seats are incredibly uncomfortable, and I have taken to bringing a cushion and/or large coat to try and stave off the usual 24 hour of back pain I tend to get after each visit.
Admittedly that may be due to my height, but at least the coat comes in handy to keep warm, as there is usually a point when I can no longer ignore my shivering.
Why do I continue to go there? Well the Unlimited card is unbeatable value if you like to see 5 or more films a month, and this is the only branch within 20 miles...