It's fine on most screens for most content on an average TV screen even. Sure, not good enough if you are sitting down in a home cinema for the latest blockbuster, but totally OK for Chicken Run, Dawn of the Nugget or just tuning out with some tolerable series.
1. It only matters to people who are used to 4K or are equipped with a 4K TV. If you don't own such screen, which a lot of people still do, it doesn't matter. You don't miss what you have never experienced.
2. When using a beamer, outright resolution is less important because the image is smoothed out. Relative to the size of my wall I don't feel like I lose detail or enjoyment on my own beamer at home than when I watch same movie in a real cinema theater. What I do miss is usually more the experience: going out, meeting friends in a neutral place and anticipate with them the screening, smelling the popcorn from the theater entrance, going out for lunch after the screening, etc. The outright resolution? couldn't care less.
