Meh, it's pretty cool, for TV.
I don't mean to put down your tastes -- we all like different movies. I'm quite sure there are movies that I think are awesome that you think are stupid, and that's okay. This world would be boring if we all liked the same stuff.
Anyway, "Duel" just doesn't do it for me. I'm actually halfway through watching it, right now, and I might not finish. The most I can appreciate it for is that it's basically an audition-tape for Spielberg (my favorite). It's like he's saying, "Hey, look what I can do -- I can shoot a compelling action scene". Cuz that's all we get in this movie, and nothing more.
It's so episodic. We get a wild interaction with the crazed truck-driver. Then we take a break. Then, we get a wild interaction with the crazed truck-driver. Then, we take a break. Then, we get a wild interaction, yadda yadda, jeez, where the fuck is the three-act-arch? This is the longest one-act movie ever.
The Spielberg adventures that I grew up on have so much more than just compelling action sequences. They have loveable characters we can latch onto. They take us through a range of emotions, romance, humor, drama. "Duel" has a dude in a car, and we don't know anything about him, except that he has to get to an appointment.
Whether I finish watching this thing or not, I think I'm gonna have to watch the climactic finale of "Deathproof", immediately afterward, to wash the bad taste out of my mouth.