I never realized how good these early Frankenstein movies were. "Frankenstein" is a great movie and "Bride of Frankenstein" is perfect in every way. Now, "Son of Frankenstein" isn't at the level of those two greats, but it's really good.

I enjoyed the performance of Basil Rathbone. He transforms from mild-mannered scientist to lunatic to murderer in practically the blink of an eye. And I know he didn't do a lot of the stunts, but I was impressed by his athleticism. There is one particular scene when he is throwing darts with crazy accuracy without even looking at the board. He's pretty good with a block and tackle, too.

Boris Karloff is underused but makes the most of the film's finale when his Monster has a temper tantrum. Karloff throws lab equipment around like toys. Actually, I'm pretty sure they were lightweight props, but it was still great. He's kind of a hit man for Igor and doesn't really have much to do here, but he's still cool as Hell.

Speaking of Igor, Bela Lugosi plays the character with enthusiasm. He's ugly, sure. But he's also manipulative, vengeful, conniving and is quite good playing something that looks like a clarinet. Lugosi is probably the highlight here.

I can't stand the Inspector character, played by Lionel Atwill. "Young Frankenstein" aside...is Atwill's inspector supposed to be comic relief? I realize that 75 years have passed, but is his character a serious portrayal or a stereotype of the times?

I was also immediately struck by the sets, odd angles and strange architecture. It seemed a very impractical use of space, but was attention grabbing, especially when coupled with the amazing light and shadow it was all shot in.

So when will these Frankenstein movies drop off in quality? Will it be the upcoming fourth movie of the series, "Ghost of Frankenstein"? Will it falter at the fifth entry, "House of Frankenstein"? It has been a treat to find out how entertaining these old Frankenstein films are.