Actually, it's based on a shitload of complaints on the official Steam forums.
How long have those complaints been there? Afaik, it gets released today here in the US, and we're the first ones to get it.
I suppose people who preloaded could have spent a few hours with it by now..
*Edit* Most of the complaints on the Steam forum seem to be from the same dozen or so people, which is usually the case whenever a new game gets released. The people who aren't having issues are too busy enjoying the game to post about it.
I did see some screenshots of some really ugly low-res textures though. This doesn't surprise me because John Carmack had mentioned they had to majorly compress some textures to get the external build to fit into 25GB. He's stated that they would most likely be releasing a higher resolution texture pack for the PC version.
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