I have recently started this show, and I have to say that I can't recommend it enough. Do you remember watching The Twilight Zone as a kid? It was kind of weird, kind of goofy, and totally enrapturing? Like a book you couldn't put down, but you didn't know what to think of it?
Black Mirror may have taken the mantle of social commentary TZ reaches for, but 404 takes everything else - a haunting reality that, instead of being this one in 5 years, is something a little different, a little off, and rapidly expands that out into something totally different. It's spooky, it's fun, and it leaves you with a question - but not a sinking dread. Comparing it to Black Mirror is obvious, but not helpful. This isn't a drama set in the future - it's speculative sci-fi with a totally different goal. Watch episode 3 and try and not wonder - couldn't this have happened? Really?
You need to watch 404 because you deserve something fun, whimsical, spectacular, but also engaging and awesome. Fall in love with the zany, and catch onto the ultimate hope in every episode.