TV shows have more variance now though. Some are only one season(and not just because they got cancelled). Or one season = one separate story, like True Detective is doing. I've watched some TV shows in one sitting before or close to it.
Some TV shows are also almost like mini-movies each episode. Black Mirror for example, each episode is a separate experience and a complete story.
but it's not exactly a 'tv show', it's tagged as "mini-series" on imdb. pretty sure a separate tag like this exists for a reason - it's a different format
speaking of black mirror though, i thought the sequel was kind of underwhelming compared to the original. it just kinda felt like they tried too hard to make it "even more powerful" than the first one so it just ended up a mess. still watched all 3 parts though, wasn't too bad