Instead of using his super-human qualities (mainly strength) to protect the people of Uruk, Gilgamesh is using his abilities to oppress the people when we first meet him.
Gilgamesh is respected and even revered but not exactly liked.The people cry out for help to Anu, their city's god, saying that Gilgamesh has been failing in his duties as a king. They say he should be a shepherd to his people but instead accosts and abuses them.
The people of Uruk specifically say of Gilgamesh that "...his arrogance has no bounds..." and "His lust leaves no virgin to her lover..." Thus they cry out for help from Anu. This is the impetus for Enkidu's creation. Enkidu comes to balance out the ambitions and arrogance of Gilgamesh.
Seeing that Gilgamesh mistreats his people, the gods create a companion for him, a "second self" (1.62), who will be his equal. (eNotes)