I have almost no complaints about the EF-M 28mm f/3.5 Macro IS STM. It's small, inexpensive, sharp, and focuses almost right up to the front element. I can nitpick and say it's not an f/2.8 or f/2 lens, but it's tough to combine wide apertures with macro capability, and the high ISO capabilities of...
Edge-to-edge sharpness; 1.2x magnification; Integrated LED light; Smooth, silent focus; Image stabilization; Minimal distortion; Compact; Inexpensive
Dim corners when shooting Raw; Narrow maximum aperture; Plastic lens mount