Those Lon Chaney, Jr. Kharis the Mummy movies are definitely a matter of taste. When I was a kid I thought the mummy was the scariest of all the monsters and, next to The Creature From the Black Lagoon, my favorite. My Mummy model was the pride of my monster model collection. But those movies just seem kind of dumb and repetitive (a big part of each one is always made up of flashbacks to earlier mummy movies!), and I can never understand why the mummy's victims just don't run away. Heck, ususally they could get away from him by just walking at a brisk pace! Of course, I still rewatch them all every few years!
I'd add THE OLD DARK HOUSE, THE BLACK CAT, and WEREWOLF OF LONDON to the list of 'must see' 30s Universal horror films.
Funny thing about THE INVISIBLE MAN, there seem to be two camps: the "pro-Una" and the "anti-Una". Some people think Una O'Connor as the inn keeper is hilarious in this (and BRIDE OF FRANKENSTEIN) and others think she's obnoxious, over-the-top, and spoils the whole atmosphere of the films.
I'm definitely "Pro-Una"!
Yeah, I liked The Creature, too... I'm definitly anti-Una... Invisible man's a great movie, but virtually every character in it seems daffy... too much lead paint, methinks...