2. Losing a long game because someone overextended or didn't go back when told to do so or doing a stupid mistake that he should never make can be frustrating, especially when it is in a long game that was fairly even. Why ? Because it wasn't an obvious stomp and you had good chances to win if that event never happened.
3. Take a break and come back after a few days if you feel frustrated with Dota. It's a good game, and the community is not THAT bad compared to how it was back in the day (partially because you cannot simply abandon a game after first blood or because you think your teammates are idiots or because they built