I am alarmingly good at Dark Star despite being in B5...

because it's a completely different game?

I'm good at mario kart so why can't I drive in actual races

Erm.... Good for you? ...Congratulations? I guess?

It's not like it has any connection to the main game anyway. Most of the times what you need to climb in ELO is good decision making, this new gamemode requires zero for you to succeed.

"omg look at me I'm so good"

Perhaps you should be playing more thresh in ranked.

lol noob me B5 ONLY THROW 20 GAMES ADAY ME HAVENT WON ONE DARK STAR N00B

Because the game mode is straight-forward?