What is TF2's Most Underused Mechanic?

Valve sure likes to create new game mechanics... too bad a lot of good ones were scrapped.

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Obviously, there are a few more interesting game mechanics I could have talked about here, but I wanted to leave the "categorized" mechanics for their own videos so I can talk about them more in depth. Let me know in the comments what you want the next video to be about! (Or join my Discord to vote in the polls there)