Jiren at least doesn't act as a general middle finger to the world building and powerscaling of his series, at least no more than any other Super character. Meanwhile, Rey doesn't have a single discernible character trait beyond an identity quest that has and will go nowhere (beyond leeching off the Skywalker legacy) and her well honed powers without much more than a few days of training (that didn't help her when she was already OP enough) directly shits on the original 6 films. Also, she's set to stomp the one of the best and the most entertaining Star Wars character at the climax of Episode IX. Yet another reason to hate Ma-Rey Sue.
Also, Jiren's silence is at least a lot less distracting than Rey's constant open mouth in an attempt to emote.