I rented Prometheus on at least 3 different digital distribution about 1.5 years ago. I just got one of my relatives (older half-brother) into movies while he was visiting for 2 months. Before then he never liked movies or TV because he never experienced them the right way. I got him hooked on sci-fi action movies from my collection. He wanted to watch Prometheus because it was part of the Alien series that we had watched, but I didn't own it. I was VERY disappointed with the experience of trying to rent the movie from various services. I tried Vudu first because they supposedly had a higher quality option. There was no way to get it on my TV in HD, even though I own a variety of streaming devices. I tried to watch in the web browser and there was no way to get subtitles (we are all hard of hearing) or HD. I never even got to ask for refunds on those services that didn't work out.
I wouldn't even consider digital purchases for my future collecting until these services get their acts together...and when I have the same features and freedoms I enjoyed with physical media.
Oh man, I remember that fiasco. That along with paying extra for an HD version on my PS3 only to get an SD version has totally soured me. Just because it's good enough for some people doesn't mean it's good enough for me.
Now, I can't recall if it was Screen Junkies/Honest Trailers or RedLetterMedia or Nostalgia Critic, but one of them recently made it clear that they couldn't get the footage they needed from a particular movie yet because the Blu-Ray had not been released yet. This was confirmation of what I already knew: almost all of the HD Fair Use reviews, analyses, and parody videos on YouTube for already released content (undoubtedly Fair Use, BTW), source their content from the BD, which means they have to use tools like these. That's why their discussions of movies currently in theaters just have clips from the trailers.
Oh! And downloading those trailers to edit into their undeniably Fair Use review was just as technically illegal as breaking the protection with AnyDVD! Yes: Google does not officially want you downloading ANYTHING from YouTube in a way you can use in your own video. They allow offline caching in certain circumstances, but that doesn't just load up in Sony Vegas or iMovie or whatever. You simply have to circumvent for Fair Use.