I don't have anything against INTJ's in general. I do, however, realize that the vast majority of the people who IRRITATE ME TO THE CORE are INTJ's, it seems.
The average INTJ isn't a problem. There's some out there, however, who just are flat out broken.
An INTJ tends to be more susceptible to several failings. Primarily, the big ones are that they get stuck on a single opinion and absolutely refuse to even consider any other viewpoint than their own, and they tend to come up with these opinions, either based solely upon someone else's work with no concept of self at all, or they develop it solely through themselves with no concept of anything else mixed in.
As such, they tend to get stuck on a very one track mind far too easily, and refuse to even consider they may be wrong. This leads to the other issues of arrogance and so on.
INTJ's are not necessarily smart at all, and in fact, most of the ones I've seen who thought they were, were often notably below average, because they lacked any real capacity to learn, or to process new information. They became so steadfast in their ways that they could not change, they couldn't learn, they couldn't become more than they were, and they couldn't improve upon their ideas. They were static, rigid, and usually very, very wrong.
Now, that being said, that's obviously not ALL INTJ's, that'd be silly. It's just that their methods of reasoning are mostly internal, and they prefer to have things finalized. With their specific thought process tending to 'end' things, and ignore future data which may prove them wrong, there are SOME who end up becoming even more stubborn than I am, which's a feat that few are capable of accomplishing XD
Most of them are pretty good peoples, but I've noticed there's definitely a trend where probably 25-50% of them just get so self absorbed that they can't even possibly fathom that they MAY be wrong. The concept doesn't even cross their mind. Doesn't matter how much evidence or proof is presented, it's all ignored, since they simply flat out ignore it as they've already made up their minds.
Once again, this isn't all INTJ's, but it's too high a risk for them it seems, moreso than other types. An ISFJ would do the same thing with emotions, but an INTJ tends to do so with whot they believe to be 'facts' or 'intelligence'.
For the most part, most INTJ's don't seem to fall into this pit, so I have no problems with most of them. It's just the unhealthy ones which have broken down I'm not too particularly fond of.