Oh gods. Nitpick it to death. Desmond is young and has flaws in his game. A player like that has to be motivated to fix it himself or he will be perceived as having attitude problems eventually. He's the new guy, of course no one is complaining about his attitude.
Of course he has flaws in his game. But you're talking about attitude problems. Nobody has ever questioned his attitude/clubhouse manner. Milledge, even before he arrived in DC, had some doubters about his attitude.
Yes he needs to improve with his glove (making the routine plays) and his bat (not being a free swinger all the time).