Just finished introducing the Star Wars saga to my sister in law over the past several weeks. Against my brother's wish we went in the order of release (4, 5, 6, 1, 2, 3). We substituted the Phantom Edits for the prequels, to avoid the awkward bits. And there was much rejoicing.
Having watched them all in a short span of time, it's interesting how filmmaking evolved in the last 35 years. Episode 2 is definitely the most technically polished / modern of the series (with its multitudes of slow zooms and pans, perfect lighting, etc). Episode 3 apparently attempted to bridge the gap, with rougher techniques, more retro optical effects, and the return of 70s scifi production design.
She didn't seem to particularly enjoy them but oh well. My brother and I did.