The way I see it, MK fans have been pleased. Kenshi was a very loved character and he became DLC, rain has a HUGE fanbase, he became DLC too. Now the roster of the original mk trilogy has been almost completed (only cyber smoke and motaro are missing). Now they release a guest character and some people are acting like the world has come to an end.
C'mon guys, MK is already an awesome game, are you really boycotting a character that might be very fun to play and really awesome just because it's not the one you wished for?
BTW I'm sure they are still going to release TRUE mortal kombat characters after this and they already stated there might be some guest characters available as DLC. So chill out people...