The prequels were both bad films, and
very bad Star Wars films, because they fundamentally lost sight of what made the OT work. It was partly the setting and universe - but it was also the characters. The fact that we could relate to them, there's a recognizable journey through that great universe, they form friendships and makeshift families. There's humor born from these characters, and moments of compassion and conflict we care about because of it. The prequels were all spectacle, and all hollow shell, totally devoid of humanity.
The Force Awakens is a pastiche of the OT in many ways, but that's really window dressing for what's important - the characters and their journey. Starkiller Base is a perfect example. Clearly it's there so we get a parallel ending to A New Hope, right down to a brief trench run. But that's not the focus of the film, nor even the real climax. It's really there as a backdrop for Han, Finn and Rey to confront Ren (in that order). The film has set up their relationships, how they relate to one another, and made us care about (or at least, in Ren's case, understand) them. And those relationships then play out in action: a desperate father's compassionate plea to his son; a son falling completely to the dark side; a man on the run, finally facing the very thing he's been running from, and doing so against hopeless odds to defend someone who once told him he didn't need help - until she desperately did; a woman finally taking control of her future and embracing her potential.
That's what The Force Awakens is really about, and that's also the kind of thing the OT was really about. These conflicts are what is playing out in the action. What the prequels got was the action - and none of the character work.
Here I'll defer to Plinkett, because video is better than words:
https://www.youtube.com/watch?v=ORWPCCzSgu0#t=355s
(about the six minute mark if the link doesn't take you there)
This is why the duels at the end of The Force Awakens are so great. There's a line in that video where Plinkett says, "Three guys we know nothing about fighting each other in a scene we have no interest in. Their flawless choreography lacks all humanity and emotion."
That's exactly the opposite of the three-way fight at the end of TFA, where characters we care about, understand and relate to are in conflict for reasons that make sense. Their choreography is rough and brutal, their relationships and emotions playing out through the action of the fight. This is what every duel in the OT films did. TFA is a return to form.
To be clear, it's fine to like the prequels. Lots of people do. But they are really shitty Star Wars films for the same reasons The Force Awakens is a great one.