Script Summary: display your skill tier in each gametype
Important Information:This "tier" script displays the bot skill level (1-5) that is used for practice matches. Tiers are no longer used for matchmaking, shuffling, etc. There is now a more sophisticated Elo-like system that produces a "power rating" for these purposes, but these ratings are never transmitted to your browser or game client; there is no way to display it with a userscript.
Think of your tier as a rough estimate of the number that's actually used. The difference between one tier and the next is not necessarily equal to the difference between one server difficulty rating and the next.