Is this common for ENTPs?
Let me give you examples, many of the people I deeply respect and find inspiration from are INTPs: Thomas Jefferson, Immanuel Kant, Page and Brin (the Google guys), Milton Friedman among others.
I find the works produced by INTPs to often be pure genius and identify strongly with it, however I do doubt that if I actually met these people, that I would get along with them very well, because I fear their need for precision, detail and depth in their studies, would honestly test my patience.
What I admire about the INTPs, when they are productive, is that their ideas and works are usually amazingly succint and spot on. Their thesis are often almost dogmatically true, rational and logical explanations of very difficult concepts.
As en ENTP growing up, I'd often have ideas and half baked theories about how the world worked and then stumble upon something written by an INTP and nod my head as I read thinking "This is EXACTLY true" - then I wouldn't finish reading it though, because I felt confirmed in what I intuitively understood but lacked stringent thinking to properly formulate.
In that respect, I think the INTP really has a special relationship to truth. Their discoveries at their best are closest to the genius compared to other types.