Rasa was the Fourth Kazekage (四代目風影, Yondaime Kazekage, literally meaning: Fourth Wind Shadow) of Sunagakure. Renowned for his ability to use Gold Dust, Rasa's reign as Kazekage was marked by his frequent quelling of rampages by the One-Tailed Shukaku, which he had sealed into his youngest son, Gaara.
Why He Sucks
When Gaara was just a baby, he decided to seal Shukaku inside him to make him the ultimate weapon. What kind of parent would do that. Minato is understandable because he wanted to save the Leaf so he sacrificed himself to seal Kurama, but Rasa, nope.
When Gaara was just a toddler, he even ordered Gaara's best friend Yashamaru to kill him.
He signed a unfair peace treaty that got Pakura killed.
He even killed his own wife when he sealed Shukaku inside Gaara.
Despite him sealing Shukaku inside Gaara so he could make him strong, he mostly saw him as a failure.
It was also his fault that Shukaku ran wild in the Hidden Sand Village.
He even performed experiments on his wife when she was pregnant, what kind of husband would do that.
He even joined Orochimaru so he could destroy the leaf.
Not only that, but he was also killed by Orochimaru, basically, he fell for his trap.
At least he still cared about his village.
He did give Gaara one more chance to live.
During the war before he died, he did forgive Gaara and told him that he surpassed him.