I don't know enough confirmed ENTPs IRL to come to conclusions but from anectodal examples and OL stuff -- I can see why some ENTPs could drive folks batty or get on their nerves. For me, it depends on the ENTP, because I could totally see myself being really put off or else finding a kindred spirit (it's all about the weighting of the cognitive functions people! LOL)
Some complaints about ENTPS:
Too kinetic energy/non-stop talking/Ne whirlwind. Will tire people out and be "a little much" for them. Or people just find strange. (Okay, this is a shared ENXP critique)
Too much lack of filter on mouth -- people find stuff said inappropriate.
Too 'pushing boundaries', testing people's limits/ joking in a way that people find uncomfortable and unwanted.
Too abrasive and possibly coupled with smugness.
I did go on a date with an ENTP dude and it was great. We had this instant chemistry and could go on wild Ne tangents together, unbridled by convention! LOL. He had this scientist meets little boy energy to him that was familiar, peculiar, and attractive all at the same time.
Another ENTP male I met, also highly (overly) educated, was just "a little much" for people. A live wire whirlwind of Ne and word plays that took you a few too many seconds to get and he was off running somewhere else. The INXJ woman who introduced me told me that none of the people she'd introduced to him could stand him, but she just instantly felt comfortable with him. I didn't find him annoying, but I could see what she meant.
Another woman and I both tested as ENTP in a college counselor administered MBTI test. It was for student government and we even did a 'how to work together better' MBTI type workshop. I disliked this woman much and didn't see much in common with her. She seemed way oblivious to environment and said inappropriate things or else would be disrespectful/rudely joking and then have this cutesy pleased with herself look on her face. Like she seriously wanted a golf-clap. She had a casual, flippant attitude about her which I know alarmed some of the other student gov officers (I know, just call 'em a bunch of 'S' nerds :P) It was aggravating having to be around her so much to work with her.