The Dishonored series is my top new IP from the last 5 years. I might even say top 5 from the last 10 years along side IPs like the Last of Us, or RDR if that counts (given that RDR was really a fairly different game than Red Dead Revolver).
Arkane is just so good. The lore they pack their worlds with is great. The imaginitive gameplay is so unique. Their game worlds are great, characters are interesting.
It's amazing how much Dishonored 1 got right, as well. In an age when the second game always feels like it "should have been the first" and makes the first feel like a tech demo (Assassins Creed, Titanfall, Uncharted, etc), Dishonored 1 just got so much right. I only played Dishonored 1 once and then went back years later after playing the hell out of Dishonored 2 expecting it to be a lot worse than I remembered, but it wasn't... Aside from some things that were a little rough around the edges, and some levels that weren't paced evenly (especially towards the end), I was so surprised how well it all still played and how unique each level felt.
Dishonored 2, IMO, was a masterpiece. The first time playing the Adermire institute level I was afraid with my heart pumping. The first time in the clockwork mansion my mind was bending around those puzzles. First time in A Crack in the Slab I was just sitting in my chair with a huge smile on my face because when I didn't think the game could get any more clever, it just did. And then replaying all of those missions using Stealth / Ghost / No Kill / High Kill / etc, just made them so much different. Playing through a lot of levels 3 or 4 times I found things that I never saw the first 2 or 3 times, ways in our out of a room. Just a brilliant game.
I'm really excited for Death of the Outsider, though sad that it's also "the end" of this Dishonored saga/trilogy. It sounds like Arkane doesn't quite know if they're going to revisit the series, but I hope they do. Although they seem firm on the idea that this is the last Dishonored set around this period -- the rat plague, assassination of the Empress, bloodfly epidemic -- and that if they do come back to the continent, it'll be at a different time with a different story. I'm okay with that because the lore is so rich that they have a lot they can expand on.