I'm probably not the target market, but my first impression of Poki is that it's absolute trash; it looks like a shopfront for the lowest quality mobile games I can imagine. The first thing I tried was a block-puzzler that involved drag-and-drop to move pieces, but the drag didn't track the mouse cursor properly.
If someone asked me "which site is leading the charge in the Browser Games Renaissance?", I would say itch.io, hands down.