I struggled a fair bit. Performance hit me hard with really bad stutter in particular during some early boss fights, I also had weird CTDs after the first patch, and of course it has the good ol partially-hardcoded key bindings were trying to use alternative input schemes such as cursors, ESDF or truly alternative input devices is a no-go. Though these days I find it difficult to criticize any specific game for that, I hate how ubiquitous this problem has become. Like CP2077 still has it after so many years, Avatar Frontiers of Pandora has it, etc etc.

Oh, and one big one I just recalled: The online would disconnect, but without telling me. This wasn't always bad, but the game would not realize it's no longer online, so sometimes it "stalled" trying to check something online. Never found out what caused that, it was gone after some patch. Long story short I waited a fairly long time, then played it after a bunch of patches when it was mostly - sadly not entirely - fine. And loved it. :)