Just found these comments on the Storage 24 IMDB discussion board and they made me chuckle:
I loved the first film, Storage, in 1978. Roy Schieder and Veronica Cartwright were brilliant, and it was genuinely creepy. The sequels were ok, up until Storage 7 where Donald Pleasance played the Mayor of London, then things started really falling apart. Between Storage 10-18 it was basically just “spot the character from The Bill or Dr Who”, as the budget was less than a trip to Tesco. I haven’t even seen past Storage 21. I can’t imagine anyone will really care much for Storage 24. I’m amazed its gone on this long, its longer than the Bond franchise by now.
To which someone replied:
Although a straight-to-video release, Storage 22 is actually a pretty decent horror. I like the time travel aspect of it and the fact that much of it is set in revolutionary France is a nice twist on the main theme.
But I agree, after 7 it was pretty much all downhill. Storage 14: Storage in Space is particularly dreadful, despite (or perhaps because of) the appearance of Danny Dyer as a cross-dressing magician (and the twist that he was his own assistant was obvious from the start).