While he has not voiced any direct criticism of the project that i recall, he has voiced concerns about the principle developers of it. Keep in mind that at on

While he has not voiced any direct criticism of the project that i recall, he has voiced concerns about the principle developers of it. Keep in mind that at one point he was so fed up with Kay Sievers that he announced he would not accept any kernel patches that originated from that person. I think it related to Sievers unilaterally deciding that the kernel, and not udev, should be responsible for loading firmwares, leading to the kernel devs scrambling to implement the required functionality. In the aftermath some kernel devs even pondered forking udev and bundling it with the kernel code as part of its userspace toolkit. And this was from before udev was merged with systemd (iirc).