@Blackquill I just watched The Last Problem, it was something else.
Indeed, it felt like I was watching Saw or Zero Time Dilemma rather than Sherlock, I half thought it was my fever playing tricks on me.
Hmm, for me this solidifies the fact that Sherlock is writing for a different audience from the first two seasons and I'm not a part of it. I long for the old days of Seasons 1 & 2 where they solved actual cases. Funnily enough, when they referenced The Dancing Men at the end of the episode with the montage of cases, I thought "Gee, wouldn't it have been nice to have seen that be the plot if this episode instead?"
And don't get me started on Eurus! A third Holmes sibling sounded exciting in concept, but talk about wasted potential! She was such a generic super-villain that I was falling asleep whenever she was on screen. Not to mention all her "amazing deductions" and brainwashing was all Tell Don't Show and so it came off as such a stretch.
All in all, a disappointing finale to a disappointing season. If there is a Season 5 (seems unlikely) then I genuinely might not watch it.