WW has been consistently my favorite for similar reasons stated above. They have a great balance of technique and power and I can relate to their size IRL. Having said that some of my favorite fights to watch have been at HW. Remember UFC 146?
JDS vs Mir
Cain vs Bigfoot
Roy vs Dave Herman
Stipe vs Rosario
Strive vs Lavar
Not one of those fights went past the second round. Then think of Fedor, Cro Cop, Randleman, Bas, Hunt, Werdum, Cain, Carwin, Randy, Rizzo, Nog, Andre, Tank, Barnett......I could keep going but you get it. To say its just big plodding sloppiness isn't a fair assessment. I love the HWs!