Yeah, it's definitely not unique in that respect. I actually like the length of all the MGS games, with the exception of maybe MGS4, which goes on for much longer than the rest. They're solid 5-10 hour experiences that are highly replayable. How it should be IMHO
Voices are fine in TTS. That doesn't bother me. The real problem is the controller, the control scheme, the busted MGS2 mechanics, the sterilization of Shadow Moses, and worse music. Abort abort.
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Simplicity is the ultimate sophistication.