I can imagine that this probably used to be a very glamorous hotel 40 years ago, the hotel is absolutely massive and there are numerous signs of past prosperity - I guess you can find similar stories in many other British seaside resorts.
Even though it looked like it was a relatively busy night for the hotel, you would still get the feeling that no one has stayed in your room (or the hotel itself) for a very long time. The hotel interior looks a bit abandoned, rooms are not in a great condition (but I 've seen worse) and you will encounter all sorts of figures: lightly dressed ladies of dubious origin, serial gamblers exercising their addiciton at the lobby's slot machines, astonishingly stereotypical old sailor men smoking their pipes at the entrance.
We only arrived relatively late at night and left early in the morning to travel with Eurotunnel, so we were looking for a cheap place to spend the night. It wasn't too bad.
If you are looking for something like this, it will do - go for it.
If you have higher expectations from your stay, I would recommend looking elsewhere.