No you are not the only one. Putting aside the little known fact that unobtainium is a rare element that repels the gravitation force of movie plots I found the 3D effects poorly executed.
Reading this sentence caused a Band-Aid® to form around the bridge of my eyeglasses.
What a difference a missing period makes, huh? 
Ahem, everyone kindly insert a mental period at the end of the sentence before “I never correlated it…”.
Thank you. 
Having it explained in the movie doesn’t make it any less contrived and silly.
If I had more time, I might compose an OP going into all of the silliness in the movie. But, I realize that “silliness” is in the eye of the beholder, and in the degree of immersion in a movie.
I enjoyed parts of the movie and I appreciate the creative energy that went into it. But, I was not swept away.
Wait, was the material actually called “unobtainium” in the movie? I thought that was just how internet posters mocked the movie. You know, by drawing a parallel between Avatar and the execrable The Core, which had a super material that was called unobtainium.
Nope, that’s what it was called in Avatar.
“Unobtainium” is a standard term among engineers for a material that would satisfy the requirements for some project if it only existed, so the term long predates The Core:
Cool, thanks for the link. Learned my something new for the day.
Now I know what all those super-profitable widgets back in Accounting class were made of.