A lot of issues that INTJs have relate to Ni taking an overly dominant role in their personality. Some examples of this:
Don't listen to other perspectives - At times, the INTJ can quickly dismiss things that others might say and have a tendency to come across like they think they are always right. Even if they do listen, they may not come across like they are. The explanation for much of this is that the INTJ can use Te to cut off new information rather than the more productive use of Te, which is to judge their insights against the external world.
Overly critical - INTJs are prone to finding fault in things and situations to an excessive degree. They can tend to blame others for things that go wrong or apply judgement towards others rather than themselves.
Don't know know how they come across to others - INTJs, especially when young can be pretty oblivious as to how they come across to other people.
Unrealistic expectations - INTJs can have excessive expectations of others as well as themselves. Nobody measures up.
Hard time communicating - They can have difficulty communicating what is in their mind to others. Sometimes, they are vague and cannot easily express the reasons for the way they thing.
Occasional indecision - Though this is not usually a problem, at times the INTJ can be overwhelmed by all of the different pieces of information, scenarios and sides of an issue making it difficult to reach a decision.
Edit: So, a lot of this is standard INTJ profile stuff. Do you agree with this? Do you see other issues? The thread is targeted at both INTJs and non-INTJs to comment on.
I'm sure the non-INTJs should have plenty to say.