I feel like this issue is at the heart of a lot of debates (the "elephant in the room," as it were) and I'd love to briefly address it. It appears to me that there are at least two major schools of thought on what a message board is for.
For some posters, the purpose of the board is simply to get pumped up about Duke. Cheer on accomplishments, celebrate successful recruits, and perhaps have some minor discussions about strategy as long as we strongly highlight our strengths and almost totally downplay our weaknesses. For these posters, talking about Duke seems to be like talking about friends: we enjoy the success and bite our tongue about anything less-than-positive.
For other posters, the boards are for good-natured but no-holds-barred discussion about Duke basketball. They are Duke fans who passionately love the team, but want to have a grown-up discussion about the team, the program, and the state of college basketball. This includes praising what we do well, but also noting what we can improve. By honestly trying to evaluate Duke, warts and all, this group hopes to have a more measured, and perhaps insightful, conversation.
I've noticed that these two groups seem to butt heads a lot. From Group A's perspective, Group B sounds needlessly, even aggressively negative, almost like a guest who comes over and starts mocking your children's photos. From Group B's perspective, Group A is being frustratingly unrealistic. A discussion that only recognizes (or excessively highlights) our positive qualities and puts its fingers in the ears for anything negative seems pointless and even a bit disturbing. Clearly there are people from each side that are actually living up to the worst extremes of these, but I suspect most people are somewhere in the middle.
Short of simply placing draconian restrictions or allowing total chaos I'm not sure there is any silver bullet for this problem. I guess I mostly want to urge tolerance for all points of view. If you're a "Group A" person, try to recognize that the desire to debate, and even question, recruiting, strategy, etc comes from a place of wanting success but also wanting a realistic discussion. Also recognize that, as fans, the prevailing sentiment here is that Duke is great. Think how boring the site would be if everyone just typed "I love Duke!!!1! Trust in K!" over and over. That's not discussion, that's propaganda.
And conversely, if you're a "Group B" person, try to remember that a lot of folks do come here simply to cheer for their team. Duke is a singularly hated program and there is tremendous value in having a place where we can get away from the "D**k sux, they get all the calls" attitude that gets foisted on us. Also remember that these are college kids doing the best that they can while coping with life in college. They have parents and buddies who may be reading what you type. Also remember that our coach is pretty good and has earned some leeway from fans with an unmatched track record over the past several decades.
At the end of the day, we're all fans and I hope we can all get what we want from the boards without impinging too heavily on what other fair-minded fans want. Otherwise, we could just split the board into "positive" and "negative"... (Just kidding).