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[LOTR] Failure of the Wizards

Why did only one of the five wizards stay on task on their mission? Why did they get distracted or turn evil so easily if they are powerful Maiar with an important mission?
gpt
Because the Miar are still subject to all the emotions and feelings we feel. They all formed their own opinions on the world and that drastically impacted their thought process over time.

The two Blue Wizards aren't talked about much. All we know is they went East and we're never seen in Middle Earth. Either they died, became distracted, or were corrupted and formed their own magical cults somewhere in Rhun.

Radagast found comfort in the natural world and did what he could to protect it. He never cared much for the people and kept to himself. However, it was never clear if this was counted as a failure, as he did act against the dark forces from time to time, assisting Gandalf when he needed him. Sadly it's implied that Saruman likely killed him before Elrond could send people to summon him.

Saruman believed it was sheer power that would hold the dark back. He went so far as to try to use the Ring itself to defeat Sauron, but even Miar can't resist the corruption of the Ring.

Gandalf succeeded because he saw the value in the everyday man. From the mightiest hero to the quietest hobbit he saw the gift that they all had. He believed that the good in all people working together was more powerful than the most ancient spells. Sure enough, he was right.