I started watching movies and series..deliberately about 10 years ago. I've kept a record of almost all of them[0]. (Before that I'd mostly just watch whatever good stuff happened to be shown on TV. Getting rid of the TV was one of the best things ever.) I've done a lot of research into what to watch, firstly best-of lists, then exploring various genres, directors, periods, countries. I don't watch anything without first reading a page or two of IMDb user reviews, which I've found the best way of almost never watching something bad/that I didn't like, and finding out what we're likely to really love. (Also a very few almost-always-reliable critics, like Roger Ebert and Louise Keller.) Watched them all with the SO, and although we have totally different interests and tastes, we seem to mostly love the same movies/series. No end in sight yet! It's been amazing. "Still" a lot of great movies and series being made, and documentaries, animations, etc. Still a lot more to explore. Whole countries yet to explore (e.g. China).

[0] http://www.adamponting.com/movies/