Well, I finally started reading Showcase Superman Vol.2. I am about 100 pages into it, without giving away story details, so no real spoilers here folks, here are my thoughts thus far:
The Cosmic Man tale was pretty cool, in that I got to see a character I never knew even existed. Bill Finger is always good for packing in a TON of story into a few pages.
The Revenge of Luthor was a really wacky tale! I mean if Post-Iron Age fanboys actually read these books I can see this story becoming an Internet cult hit. Countless funny quotes. Jerry Siegel said he liked to write humor tales and which he could include them more into Superman, I am glad he finally got the chance. (They wouldn't let him during the Golden Age)
The famous Super-Menace epic certainly lived up to the hype! Otto Binder made Captain Marvel the greatest Golden Age hero of them all, and he works his magic here.
The Mighty Maid tale was just more freaky Silver Age kink to be place in that rather large pile. Otto Binder has issues
The Lois Lane/Clark Kent tale was a neat little tale which was pretty funny. Jerry Siegel shows off his humor once again.
Superman's Mermaid Sweetheart featured great sweeping artwork by Wayne Boring, he was really at his best with these types of tales. Jerry Siegel is also good at darker tales as well.
The Trio of Steel seems to be one of those stories that started as a cover 1st and poor Jerry Siegel had to figure out how to turn it into a story, at least that's the way it reads.
And that's where I left off.