Well CS was the original Mod to commercial game (done by the original developers after Valve took them under wing). Portal is really just something different that I don't think should be compared. Many of those other mods are just go betweens that will never get any more than a tiny spot on PC gamer for their efforts. It's really just a matter of timing, right quality, right content, right team, right time.
the future of game development and where it leads
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