Though I am just now easing my way into the more competetive side of MK and other FGs, I have played SFIV and TTT2 a bit before just coming back to my comfort zone of MK. What has always made me enjoy MK9 above all is the easy execution factor, I have no issues with moves that require QCF or QCB and what not to execute a move, but I do not enjoy a charge moves, to me they are annnoying to pull off. Not to mention some of Capcoms fighters are just broken in many many ways, such as SFxT, which when reading the rules of the game in a tournament proves its broken, not to mention their insane money making scheme with on disc DLC, anyhow thats a story for another day. MK to me has always felt to have the most balance I've seen in a FG and as far fundementals go yes I feel that MK just has different fundamentals than SF or other fighters have. Also blocking in MK IMO is more stratigic and tacticle to execute, instead of just holding back all the time one has to trully learn to read their opponent and know exactly when to hit that block button, not to mention that your are severly punished for being such a block horder, that chip damage really can add up immensly.
Now I am not knocking other fighters, but I feel SFIV is too technical, UMVC3 is quite unbalanced, Tekken brings the phrase of techincal to stupid levels, and SFxT is just $h!t.