It's the attitude that annoys me, I guess. A lot of OSS stuff doesn't feel like it's made for "real" people - sane defaults and such. With i3wm specifically it's just more obvious because it's minimalist-to-a-fault, but there are little things I find counter-intuitive even in something like GNOME.
And while I do appreciate modularity of a light WM, and being able to fine-tune things to my liking, I'd like to see more projects like elementaryOS, regardless of how many times people say it's all "bloat" or "botnet".