Bobby Kotick: Bad PR and the milking of every franchise Activision has
Peter Moleneux: He over-hypes his games way too much. Just needs to concentrate on making games as his PR is pretty poor.
Most PR and presentation guys, but I think Aaron Greenburg is probably the worst out of the lot. Although Kaz's "Riiiiiidge Racer" pushes him up a bit.
Itagaki: Disrespectful to a lot of people.
Game "journalists" who mis-quote, mis-translate and mis-guide.