These guys aren't "attitude problems" both are energetic and quite coachable...if anything, the teams biggest problem is getting its PG to pass and its big men to pass up shots when they touch the ball - Walker and Giddens have played pretty smart bball while down there, something that can't be said about most of the Flash players...
Well to be fair, they both did have some red flags characterwise coming into the draft. Although these terms like "attitude problems" and "character issues" always get thrown around too much, and the actual issues (which are much more important, when it comes to evaluation) are actually lost.
Walker's "attitude problem" was that he played with too much emotion. He was known as a guy who couldn't control his emotions on the floor, and in the past it was at times a detriment. Of course as Celtics fans, we have seen two other examples of guys who wear their emotions on their sleeves in KG and Perk, and have seen the positives and negatives that go along with it. I definitely don't think this is an issue, and I think it may have even been a positive when Danny drafted him. Some people consider emotion to be playing with heart.
Giddens is more interesting. He absolutely was accused of having attitude problems on the court. Of course this was all in the past, and many people attributed it to an overreacting coach, but the accusation is there, and legit. But he also was a model citizen his senior year, and seemed to grow up a lot.