I'd say you just wait. This is just one of NUMEROUS patches that need to come out, not to mention PC is behind in terms of DLC releases, which you're entitled to because of your Season Pass. And Fallout 4 will keep you occupied for a while, not to mention other games coming out in the Xmas season. Hell I'd say just wait until 2016 to play. Yeah it sort of sucks to have to wait a half a year to play a game, but at least then you'll get what could loosely be called a "complete" version.
That's probably what will happen unless I squeeze it in before the big fall games hit. I mentioned Fallout but that's just one of the games I want to play this Fall. There is also Mad Max, The Uncharted Collection, Halo 5, Black Ops 3, Star Wars Battlefront, Rise of the Tomb Raider, Just Cause 3, and Rainbow Six Siege. I've been waiting for a good price on Dying Light since February and I plan to restart Tomb Raider when it goes free on Games With Gold too.
There is no way I will get to even half of those games this year. My wallet couldn't take that and even if it could I wouldn't have the time. Still, Arkham Knight is something I was excited about for a long time. I will get to it and it's DLC content at some point. It sucks that I couldn't play it when it came out and there weren't a million other games being released at the same time.
Edit: I just read the patch notes. SLI support is one of the things singled out for future patches. That right there is enough to tell me that the game isn't ready for me yet.
When the game first launched I had terrible framerate drops with SLI enabled. The game actually ran better when I disabled one of my 970s. It still had hitches from time to time but it was much better in general.
Edit 2: The game still hasn't been made available for sale again either. Not only that but they had the gall to say this without even mentioning any offers for people who dealt with this crap for over two months.
"We would like to thank everyone for their patience and invaluable feedback," the statement said. "We’ll provide ongoing updates here as they are made available. In the meantime, please enjoy the game with the latest patch"