The 30s. The film industry was just getting started. These are what they were just starting to put out, so we really shouldn't expect anything all that grand scheme of things. There weren't many special effects, if any at all.
 
THE MASK OF FU MANCHU 32
CHARLIE CHAN IN LONDON 34
CHARLIE CHAN IN EGYPT 35
CHARLIE CHAN IN HONOLULU 38
CHARLIE CHAN AT TREASURE ISLAND 39
CHARLIE CHAN IN THE CITY OF DARKNESS 39

 

The 40s allowed for a little progress. People started to experiment more with bluescreens, and they finally had some stock footage to work with. This allowed in the expanded storylines that weren't able to be capitalized on before hand.
 
THE JUNGLE WOMAN 44

 

The 50s were the beginning of the great scifi explosion. Of course by today's standards, it's really, really bad scifi. I have no idea how they felt about them back then, because I'm pretty sure I would have thought it to be crap then too.
 
BWANA DEVIL 52
DON'T BOTHER TO KNOCK 52
TEENAGED DEVIL DOLLS 52
THE BEAST FROM 20,000 FATHOMS 53
DONOVAN'S BRAIN 53
GODZILLA: KING OF MONSTERS 54
JUNGLE MAN-EATERS 54
NAKED JUNGLE 54
EARTH VS. THE FLYING SAUCERS 56
SHAKE, RATTLE AND ROCK 56
I WAS A TEENAGED FRANKENSTEIN 57
OMAR KHAYYAM 57
THE 7TH VOYAGE OF SINBAD 58
BRAIN EATERS 58
HOUSE ON HAUNTED HILL 58
QUEEN OF OUTER SPACE 58
THE GIANT BEHEMOTH 59
THE MUMMY 59
THE TINGLER 59

 

The 60s heralded the entrance of the teen movie. These were movies that teens went to, not to watch, but to make out. Thus they really didn't need to be all that good at all, and they weren't.
 
HERCULES VS. THE HYDRA 60
KONGA 61
MASTER OF THE WORLD 61
THE PIT AND THE PENDULUM 61
DON'T KNOCK THE TWIST 62
REPTILICUS 62
TALES OF TERROR 62
BEACH PARTY 63
GIDGET GOES TO ROME 63
THE HAUNTED PALACE 63
THE HAUNTING 63
HERCULES vs. THE MOLOCH 63
X: THE MAN WITH THE X-RAY EYES 63
BIKINI BEACH 64
MASQUE OF THE RED DEATH 64
MUSCLE BEACH PARTY 64
PAJAMA PARTY 64
ROBIN AND THE 7 HOODS 64
TOMB OF LIGEIA 64
TRIUMPH OF HERCULES 64
BEACH BLANKET BINGO 65
DR. GOLDFOOT AND THE BIKINI MACHINE 65
DR. TERROR'S HOUSE OF HORRORS 65
FRANKENSTEIN CONQUERS THE WORLD 65
THE GIRLS ON THE BEACH 65
GODZILLA VS. MONSTER ZERO 65
WAR GODS OF THE DEEP 65
DR. GOLDFOOT AND THE GIRL BOMBS 66
GHOST IN THE INVISIBLE BIKINI 66
REPTILE 66
COOL HAND LUKE 67
PREHISTORIC WOMEN 67
5 MILLION YEARS TO EARTH 68
DESTROY ALL MONSTERS 68
ON HER MAJESTY'S SECRET SERVICE 69
VALLEY OF THE GWANGI 69