Ok, just finished the "Good Karma" playthrough. I didn't touch Dark Souls II yet (although I should probably try to finish DS I first, I stopped after it kicked my ass so hard I couldn't sit for a week), and there's that second season of Walking Dead ongoing, and at least one game scheduled to launch this year should be great but... Damn, I think this will one of my main contenders for GOTY come the end of year. It's shorter than the previous games (2 islands instead of three, and only 13 districts overall. I don't know the topography of Seattle, but I assume it's because it was supposed to be similar to the actual city), but gameplay was greatly improved, and it made great series just that much more awesome. I thought that Smoke Powers are the most awesome things ever, but when I got Neon and (especially) Video, I hardly ever used it again (although, this is probably related to Neon and Video powers much more convenient to travel across the city). Nothing is tacked on, everything that is there, has a purpose, and it's to be fun.
The story - it's good. Nothing mind blowing, no plot twists that will make your jaw drop, but it's a solid story featuring really well written characters you can actually sympathize with (or despise).
From me, solid 9/10 and mark of approval. If you have a PS4 and you don't have this one... Well then why the eff did you bought this console at this point anyway? Go to your nearest game shop and buy it. This was a first really worth waiting for exclusive for any new console (I'm excluding Titanfall, because it's on PC as well), and it delivered. Definitely worth your time and money.