I wasn't keen on the astral projection stuff with Luke at the end - felt weirdly unsatisfying as an ending for some reason - and I found the Leia scene weird, but I did like how the Force was presented as more mystical/magical in this one.
One of the great disappointments of the prequels for me was that after so many years of wondering what the Jedi could do, the answer was: 'basically, not much beyond what we see Luke, Vader and the Emperor do in the originals'.
The RLM review really nailed this point - I always read it that the Emperor zapped Luke with lightning on a whim - we're just seeing a fraction of what he's capable of. But as far as the prequels would have us believe, the lightning thing is pretty much the limit of what he can do, oh, and and all dark jedis can do it.
There's a similar point made about robes - ie that Obi Wan wears robes because he's an old hermit who lives in the desert - and this somehow ended up being the de facto jedi 'uniform' in subsequent films.