I do agree, Heca is very bad compared to other junglers when it comes to damage. But oh my how many of these deaths you could have avoided if you had proper game sense and didn't pick fights where you placed yourself between 3 enemies without a single teammate even being nearby. Seemed to me you were inting on purpose. Your main goal is to set up kills for your teammates: Run at your enemies from behind, knock them into your teammates. And during teamfights, ult as many enemies, and then use your 3rd ability to escape or disposition enemy carries so your team would get the kill.