LogFAQs > #903694979

Note that I'm playing the port of the original PS2 version, not the HD Collection version which is apparently fine.

-Resolution doesn't go above 480p. And by that I mean the game window is literally 480 pixels wide and the size can't be increased.
-Controller support doesn't work. It's coded into the game but just...doesn't work.
-There's massive framerate drops that make it borderline unplayable. The way to fix this, before a mod salvaged everything, was apparently to delete all the music files in the game folder.
-Randomly deleted Steam.dll from its game folder, meaning the game could no longer connect to Steam and wouldn't run. According to google, this has happened to multiple people.
-Doesn't even have a unique Desktop icon. It's just the generic 'windows file' icon.

There's more stuff I'm forgetting. It's just a huge mess. A fan mod fixes most of the problems but without that it would be really, really bad.
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Black Turtle did a pretty good job.