In a lot of threads, I see people complain that most pro MMAists striking ability is sloppy but with some (Fedor, Liddel, etc.) their sloppy striking is quite effective.

Is it solely strength training and conditioning that makes these attacks effective?

Is it that other attributes (timing, distancing, speed) are more important than how the technique 'looks'?

Does the appearance of the strike affect is effectivness?