ever since MKT (which came out before MK4 i suppose) i don't have much favorite changes...its like every second thing annoyed me, MK4 those stupid weapons and ability to pick up things from the floor, the same stun/dizzy animations for all characters (a small thing, but still...), general characters design (it looked like they all made out of paper and cut...) and such...in fact i liked MKDA changes MUCH more than MK4 changes...new modes, characters designs still somewhat acceptable (not mind blowing but still better than most of MK4 ones...) and so on...MKD was ok, but not better than deadly alliance, except Sonya's outfit were changed for good, MKA is poor crap, nothing impressed me there, not KAF, not Konquest, not those silly Motor Kombat game and finally MKvsDC is...- well...no comments...and after MK becoming worse and worse with each game finally we got something that i call the beacon of light...a new and completely revamped MK game MK 2011 (or 9 if you like...) which has yet the least of those flaws from previous games and kept maximum factor of balance between strong violence and pure fun, both of which are put in considerably high stakes now...i can't really think of any downers except two small, very small things - 1.characters still shre the same dizzy/stun animation (kind of lazy on WB and Boon team's part...), 2.female fighters look a bit like hookers now (no jokes about my nickname please ^^) i mean like high hills + exposed bodies...well mileena is supposed to look much like seductive and exposed, but not others...other than all that its nearly perfect!
...and on the subject of the question...yes! i have characters, changes of which i don't like and its Reptile, with every single game he's getting worse and worse (not a fan of his lizard looks...), also Cyrax could be much better...as for others they're alright...as for favorite changes, like i said i don't have characters, changes of which i'd welcome, not even single example, i like it all classic way...as classic as possible...back to the early-mid 90's...a bit silly, a bit cheesy etc...all those bits, what made them perfect actually...