the amazing thing about watching the OT as a kid was the sense of mystery and adventure. There's very little mystery when youre watching a half remake of ANH.
		
		
	 
I think an important aspect of the production of this movie was that it wasn't 
just catering to the nostalgiagasm of 18- to 34-year-old fans, but also designed very consciously for kids watching the movie in theaters... kids for whom The Force Awakens will be, in some very meaningful ways, the first "real" Star Wars movie they've seen from their perspective. 
I watched TFA at its opening sitting next to my 12-year-old nephew. He has seen all 6 other movies and loves Empire, but it's really the general universe and 
idea of Star Wars that he loves, rather than the films of either the original or prequel trilogy "being Star Wars" in his mind. For him A New Hope is almost more of a novelty than a real movie. This is difficult to explain without the context of watching a kid grow up and get into Star Wars just over the last decade, but it's sort of like... we all know when watching Episode IV that it is the genesis of Star Wars; without it, there would 
be no universe for all of these stories to take place in. It's impossible for us to detach from the knowledge that it is what sparked this gigantic imaginative journey in the first place.
But it's not like that for him. Try to imagine that somehow, Star Wars was already a completely established universe with lots of stories in it to choose from and then A New Hope, just as we know it today, was released. How would it feel? There's been a lot of discussion of it being a film that was a garbled behemoth during production, largely saved in editing. The sound design and some of the effects, especially the matte paintings and miniature work, hold up wonderfully. But my nephew has grown up seeing countless fan films on YouTube that look more impressive than Luke's saber training with the floating ball. Rotoscoping relics like the saber appearing white when it should be blue are hilarious to him. Hamill's acting is often chuckle-worthy from a modern perspective- imagine Luke without the weight of the saga behind him, John Williams' ethereal score or Alec Guinness and Harrison Ford to play off of and the character isn't quite so compelling in that movie as an isolated story. I say all of this as someone who absolutely loves the movie; I've seen it more times than any of the others. And for that matter, he loves it too- but the sense of mystery and adventure in Episode IV just isn't as strong for him as it was for me- he "knew Star Wars" before ever having seen it.
Fast forward to The Force Awakens, and... yeah. He's over the moon about it. All of that mystery and wonder I experienced as a kid is what 
he's experiencing right now. He couldn't care less that the story beats are retreads of previous ones. He even acknowledged that "they already do that all the time" as in RotJ and the many references in the prequels. Whereas for us it feels so much like all TFA wants to do is desperately be like the OT, for him there's what Star Wars used to be like and what Star Wars is like right now, in real-time. When the movie ended he immediately goes, "holy crap I hope they make another one." And then I told him we already know there definitely will be an 8 and 9. That look on his face, 
that's the mystery and wonder you're talking about, and I promise you it's in there, even if it's harder to perceive as people who grew up on the older movies since that's all there was for us. 
None of this is to take away from the magic of the OT and I know that kids enjoy the prequels plenty (well, parts of them) too. But I promise you the movie was made with this factor in mind and it was one of the things it did get right.