I don't think that a statistics tab would cover all the gory details that I log in my spreadsheet (my deck, faction of opponent, win/lose, gg/no gg, gloating, interruption of opponent's strategy, opponent's interruption of my strategy, cheap wins, mood after the match, estimation of newbie status of opponent, his rare cards, his use of a current meta cookiecutter, short description of his deck)
... but it sure would be nice to have a raw win% overview in the game.