Back when I was around eight years old, my favorite comics in the world were the team up books; Marvel Team-Up, Marvel Two-In-One, World's Finest Comics, The Brave and the Bold, etc. One team-up book stood head and shoulders above the rest: DC Comics Presents.
Every month, Superman teamed up with a different guest star. The Flash, Green Lantern, Adam Strange, even He-Man and Santa Claus eventually made appearances. It was pure comics gold for a kid.
For it's time, DC Comics Presents was loaded with great artists. Jose Garcia Lopez, Rich Buckler, Ross Andru, Jim Starlin and Curt Swan all had penciling duty in the first 26 issues. The writers weren't bad either. You had Steve Englehart, Len Wein, and Marv Wolfman, among others.
The first comic I remember owning was an issue of DC Comics Presents where Superman teamed up with Robin so the series has nostalgic value galore for me.
As for the stories themselves? Well, my eight year old self was much easier to entertain, I guess. If you come in expecting today's kind of stories, you'll be disappointed. However, if you're looking for some superhero fun from the days before Watchmen, you'll be entertained. Come on! You've got Superman teaming with The Flash, Adam Strange, The Metal Men, Aquaman, Green Lantern, Red Tornado, Swamp Thing, Wonder Woman, The Atom, Captain Comet, Firstorm, Mr. Miracle, Black Lightning, hell, even Sgt. Rock. The list goes on and on. Superman met a lot other superheroes on a regular basis back in the day...