Morkus from Orkus
I go the other way. "It's compatible if the DM puts in the effort to make it work" is too broad. By that measure(the one people here keep telling me is correct), every RPG is compatible with every other RPG. With enough effort I can make any two RPGs compatible.Well we know character creation will be different - it already is with more recent supplements. So by that measure we are already incompatible!
I think that is to narrow of a definition of compatibility.