You're not alone. My Marvel collection (Superhero Squad not withstanding) is made up of the various animated lines from the '90s. Since Spidey and the X-Men are my favorite parts of Marvel, those collections are pretty darn thorough.
I do wish they had made more characters from the Captain America/Thor books, but since they didn't have cartoon tie-ins, it makes sense.
They're colorful, eye-catching, display well together, and there's some great character selection.