Have all major issues been fixed?
The missing effects have been fixed in the initial patch a week or so ago, but the performance issues/other bugs have not. Apparently Rocksteady is working on it, unfortunately no timeframe has been given. It still has not been reposted for sale on Steam.
I'm glad I got it on a good deal from GMG, but of course it's still frustrating to have to wait longer to play it properly..