I agree, if players are rugby tackling players and making ridiculous leaps at the player, that's fine. I don't disagree. I'm all for red cards when its dangerous and stuff. But yesterday wasn't, it was an honest slide for the ball with hadly any contact. Length of sin bin time would need a lot of deliberating on. You would need to get it right. 30 mins maybe? 25? I don't know. Something significant anyway.
Whether it was cynical or an honest attempt to win the ball, the end result is a clear chance to score was denied and it has to be punished equally as harshly as the attacking team losing that chance.