My pals have been calling rengar useless and I want to persuade people he is not so this is my 1st build plz leave comments.

The most important thing for rengar is the element of surprise, the most effective way is either ulting when there are no bushes or jumping from a bush when they are farming. With his high ad you will at least take 10% if their health which will give you the edge in battle. His ult can also be used when you are being ganked. It is impossible to 1v5, rengar can take them on 1 at a time in a row but he still can't 1v5. therefore try to save your ult for their carrys or escaping.