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I'm not certain what you mean by imperfect, but i can say why there are lambda symbols everywhere. As of half life 1, where the symbol was a prominent directional hint to the lambda sector, a crucial objective to reach, the symbol has become the icon of the half life series, with it featuring in almost all concept art, also appearing in some of valves other games. (Left 4 Dead 2 for example) Besides that, it appears in the game as a way of hinting towards hidden caches of various goodies, seemingly almost as the icon of the resistance (i'm not entirely sure who goes in to such ungodly places with orange spray paint, or how and why the resistence knows so much about lambda but that's just me)

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