Sometimes in ARAM you just flat out lose a game because the champions they received were better, it would be cool if op.gg could come up with some statistic to determine this and add that label to ARAM games.
It could also happen in summoners rift actually, but that sounds like a harder thing to properly label.
You wouldn't want to see this on a winning game, but on a loss it could be nice to see some validation (if there is reasonable statistics to back it up) that the game was just lost at champion select (or at least made very difficult because of it)