It's fair to say we've been highly critical of Canon 's compact system camera EOS M line. For a simple reason, though: the Japanese company's mirrorless cameras simply haven't been able to stand up to the competition.
Small size; big step forward for EOS M series; fast autofocus setup (finally); decent viewfinder and touchscreen combination; access to lots of lenses (via adapter
Battery depletion issues; autofocus setup can't compete with the best mirrorless cameras out there; high ISO sensitivity shows off image noise; no 4K video; expensive compared to competition