Ya I'm with Voodoo on this especially considering Conan is absolutely a franchise that spans books, comics, movies and video games. And Savage Avengers is pretty damn entertaining but Marvel is also doing standalone Conan stories that are set in the "Hyborian Age" so I think we can have our cake and eat it too with regards to having crossovers and standalone stories. (If Conan is anything to go by
Guardians vs Aliens makes sense in the fact that they already are in space. Really any of the space based characters could have the potential for crossover that isn't overly forced so Thor, Silver Surfer, maybe Inhumans just to name a few.