Eh, I dunno. I got my ENTP boss 12 years ago because he used to come and chat with my then-boss, so I had the opportunity to observe him for some time before I made him aware of myself. He intrigued me. When I talked to him, he interested me. When I proposed that I be his assistant, he immediatelly accepted. Then i had to have a knock-down-drag-out fight with the boss I had, so I could work for the ENTP. Fortunately, the ENTP was senior to the boss I had, so he was able to prevail for us in that situation. 12 years in a job is a long, long time. I'm bored, so bored I could die. I went in and talked it out with my ENTP boss. He knew exactly what to say to rekindle me. What Vasilisa said way upthread is right -- he's a vagabond and I'm his home. ENTP needs that, or at least the one I know does. He needs a wife at home, too. He really suffered when he was between marriages. So I guess I get to see an ENTP from a perspective that some don't see -- as an assistant, not a romantic partner -- as a sort of friend, but with a built-in distance -- very good for observing. They only appear to be flighty. They're actually intensely faithful in their hearts. I can understand that in a romantic experience, INFJ might feel neglected while ENTP runs merrily off to be entertained, charm and be charmed, but they do seem to need their safe place, and if you are willing to provide it, you can rest there comfortably for about as long as you like. If you want something, ask for it. I haven't been turned away once.
Mine is good with arguments, too. We can yell at each other and still make sense, and there are genuinely no hard feelings after. We can and do say pretty much just what we think, and it's fine. I feel that overall the give-and-take is good. I have many flaws -- he sees them all and accepts them as coming with the territory, and vice-versa. Which is refreshing. I think that is a good word for the effect on me -- he's refreshing.
I don't know that I would marry one, but I've been happy in a work relationship with one for longer than I've been happy ever with anyone. FWIW. I fantasize that I would like an INTJ in my personal life, but who knows. ENTP is very engaging.