So many things come to mind, but the ones that stand out in my mind:
1. Prof Sid Watkins Death
2. de Villota’s injuries
3. Schumi’s penalty ruining his Qualifying Result in Monaco. As a Schumi fan that is one that sticks out for me, not that I’m suggesting that Schumi didn’t deserve the penalty, he did have some brain fade moments running into the back of Senna and JEV, the penalty over shadowed what should have been a stunning Pole Position.
4. Ferrari pushing to win a championship by way of appeal (yellow-gate). To me, if they had of succeeded, this would have damaged the sports reputation. Don’t get me wrong, if there was a clear violation of the rules, I’m all for the rule makers stepping in and policing the issue, however, this was a way that Ferrari saw they could exploit to win the 2012 championship.