Did you see Hopkins' column in the current RoadRacing World magazine, where he talks about his interaction with Mladin at Sepang when the Suzuki AMA racers practiced with the GP team. Sounds like a total ****head! Of course, that is just one person's perspective, but it matches what I hear from others.
I think we have gotten spoiled by the large number of top riders who also have charm and charisma, and who seem to be good sportsmen and truely good human beings -- guys such as any of the Haydens or Bostroms, Rossi, Colin and Troy come immediately to mind.
Then you have the guys who, at least as perceived publicly, come across as arrogant whiners and/or just plain pricks. I'd personally add a couple of Roberts brothers to your list.
These guys all may be personally great guys, but if so, they need to hire a PR consultant. Their public image is limiting their professional options. If you were putting up your money for a race team, would you rather hire someone who, while fast, publically bad-mouthed his team, the sponsors and suppliers, as well as the competition, or would you rather hire someone like Nicky or Eric?