Well, the biggest issue people seem to be having with the actual content being put out, independent of the long release schedule issues, is that KoD is turning out to be a lot more like The Last Sovereign, with its focus on plot and systems and character development over porn, than Noxian Nights, which was a cookie-cutter RPGMaker fuckfest from start to finish that made you go out and whack goblins every so often where the characters bore only a passing resemblance to the originals. Sabia herself can be played more like Simon if she's on the Dom path or Riven if she's on the sub, but the differences go beyond that.
Sabia is much more of a rounded character than Riven was, for example. Even on the sub path, sex is clearly a tool for her. You can make her fuck everyone she can to gain an advantage or a favor, but she's not going to just go down and work the tents for the fuck of it. The solution Hreinn seems to have decided on to compensate for the drop in Sabia dickings is to feature the other girls - Neve, Ylva, Maply, Vehlis and Elmy - in a variety of other sexual situations. Now, in Noxian Nights Irelia and Katerina had their own scenes as well, both solo and group events where Riven either wasn't around or wasn't participating, and no one had a problem with that because Riven was getting a bunch of scenes herself and had a few repeatable scenes unique to her. Sabia by contrast is having LESS sex as time goes on and no repeatable scenes at all.
Now, the argument can certainly be made that Sabia having less sex makes sense, even if she is a sub, because she's reached a point where she doesn't need to fuck as much any more to gain power. By this point in the story she has her own raiding group, has solidified her position as a rising power within the tribe, and theoretically has enough lundils to avoid working in the goddamn General Store again, though every update keeps proving me wrong on that last point. But that argument goes to my original point, which is that KoD's first priority is clearly not the porn. Which is all well and good, but I can see why people who were expecting Noxian Nights: Copyright Free Renpy Edition would be increasingly disappointed by the game's trajectory.
Truth be told, I think KoD is at its best when it's focused on the character interaction and at its worst whenever it makes me play Simon Says: Silver Swords Edition (Now with 200% more MOMENTUM) (Also Featuring the WILD AXE from Jadk's Bar). I can't say I play it for good faps. I realized early on that wasn't what it was going to be focusing on. Honestly, there are only two scenes I have fapped to in KoD, and both of them have been done better elsewhere.
TLDR: If you're into KoD for the characters and story, playing every update will probably be worth it for you. If you just want to see Sabia fuck an ever-increasing variety of penises, you're better off waiting for every other update, at best, or finding something else to spend your money on (assuming such folk are among us).