There's a stronger player base overall in the SFIV community. International Marvel IS still really small compared to U.S. --- "putting "Shoryuken/SRK" on your user name makes you better at fighting games. oh wait, no it doesn't." -ER.MCZ Tatsu
I'm more inclined to believe that the lack of Marvel's addition was more due to a licence issue. I mean the question about SF4' s popularity against MVC3 doesn't mean much when you factor in SFxT's addition to the IPL mix as well...(btw I'm not crapping on SFxT as a game itself, just saying that it's undeniably a whole lot less popular than MVC3 (US and internationally), not to mention SF4) --- oh ok.