Just watched all four last week, so it pleases me to see this thread. I agree in my ranking with DominicCobb, but I also agree with the OP in that all four are good films. My least favorite is KOTCS, but I appreciate it for what it is. It was meant to focus on the fascination with sci-fi during the 50s, with flying saucers and Area 51. I'm okay with that. I like its lighter tone, its humor, its self-deprecation.

And IMO, the Mummy films are moderately enjoyable, but don't even approach Indiana Jones in style or enjoyability.