My main pull into Minimates was the MvC3 line, but I've bought The X-Files ones, Big Bang Theory, Peter Pan, Thundercats, Spongebob, some Ghostbusters, the majority of the TMNT line and the odd other one. TMNT was ended just as it was about to get really good, Spongebob continuation seems like a no hoper, Pan was unfinished (those dang missing lost boys), and the X-Files release was so long ago I figured that the second set was probably nixed too (I kinda have a feeling we'd get more versions of Mulder and Scully too, rather than the Gunmen or Doggett).
I suppose I was hoping to be able to boost my MvC collection, as they are by far my favorites and they make up the bulk of my collection. I was annoyed at the time we didn't get the Ultimate cast (Frank West, Strider, Rocket Raccoon etc), and I figured Infinite was our chance to get them. I guess not :(.
I'm not a Kingdom Hearts fan (at least not yet as I've never played it) and I've got just about everything from Marvel I'd want, short of a set specifically aimed at the 90s animated X-Men/Spiderman shows.