I can't replicate your experience, but I used my M with 22/2 lens today at a birthday party for my neighbors 5-year-old daughter and it did OK. It performed better when the kids were semi stationary than when they were running around, but overall it performed better than I expected.
The image quality was really good, even at 3200 ISO. My biggest issue was recovery time between shots rather than AF performance. I missed some shots waiting for the camera to write to the SD card at times. I was pretty pleased with the video as well.
After 5 days with the M+ 22/2, I'm very happy with it. I've mostly used it for landscapes and shots of the kids around the house and it has performed very well in my opinion.
Well, the event i was shooting at is a yoyo competition indoors so the lighting was variable throughout the day..the ISO was at least 1600, and the players moved about the stage very quicky and in quick succession..so that's why the AF failed..by the time it caught focus, the player already moved..even in video mode, it just refuses to track and keep focus..
well, the cameras we usually use to shoot are the 1dx and 5d3 so i just tried out the M for fun since we already had main photographers shooting anyways.. the off stage photos turned out great with the M..as long as there are no super quick movements, the camera is great..
i was just slightly irritated that other brands at similar pricing performed better at the same event..i wasn't the only M user there and the other guy also gave up