Here's the AnyDVD information window, I'll check the DVD with CD-DVD Speed shortly (although seeing so many others can back it up, I think I bought a defective disk, looks like I'll be exchanging it):
Summary for drive E:
Drive (Hardware) Region: 1
Media is a Data DVD.
Booktype: dvd-rom (version 1), Layers: 2 (opposite)
Video DVD (or CD) label: STEAMBOY_DIRECTORS_CUT
Media is CSS protected!
Video Standard: NTSC
Media is locked to region(s): 1 4!
Found & removed RCE protection!
DVD structure appears to be correct.
Structural copy protection not found.
Found & removed Autorun from Video DVD!
Bad sector protection not found.
Emulating RPC-2 drive with region 1!