It's worth seeing I'd say. There's a film within a film which is, I'm pretty sure, doing a parody oer nod to Antonioni with his desert scenes and blue skies, but it's actually visually gorgeous. Though that has the effect of making the grainy closeups of the rest of the film look a bit drab.
It's successful in that for the most part it does look and feel like a film he might've put out in the late-60's early 70's. Though the downside of that it's kind of dated in its concerns a lot of the time, it's basically angsting about a film culture that's only relevant to film students. There's also some casual homophobia in there for good measure.
There was a slightly odd decision to make a reference to cell phone cameras in the very first lines of the film, right after the card talking about how it was an attempt to recreate Welles vision as closely as possible. I somehow doubt Welles would've had the foresight to predict the invention of phone cameras had he finished the film in his lifetime. But I'm guessing they put that in to put some modern context for why everyone in the film is filming each other at all times (it's basically a found footage film).
One thing I learned from the doc was there's at least one other mostly finished Welles film, The Deep, which looks pretty good and apparently is only missing sound. They did a great job with the sound on this film so hopefully one day Netflix will shell out to get that one finished as well.