You caught me here ; I would have to say none but I am outside +/- 2 sigma of normal distribution and I have a feeling so are you (which side is not important ). OTOH, deficient may be better choice of word (not perfect though).
Seriously, how many people here would have bought it just for the product; without $299 deal?
I had to join this forum just because I find the rumors here very interesting at times and it seems a majority of the threads I enter for the M are full of people mindlessly bashing it based mostly on reviews or opinions they heard about it.
I bought my M for $400 about a month before the fire-sale and I don't regret it one bit, I nearly paid $499 for it and was excited to see it on sale for $399 with the 22mm STM.
Before buying it I was almost certain I was going to buy a NEX-5 or Olympus EPL-5, both were around the same price as the M at the time and I refused to pay more than that for a backup camera. I went and tested the 3 cameras in a store and couldn't believe the bad rap the M was(is) got, yes the focus was slower than the Olympus and the Sony, but definitely not so slow that it was un-useable (and this was pre-firmware update). I still wasn't sold on it, but then I used the Sony's awful (imo) LCD sreen (colors were off, resolution seemed much lower than the spec sheet) and the even worse menu system, took it out of the equation. Then when trying the Olympus I was very impressed by the AF speed, but again the LCD was awful and the menu's were barely any better than the Sony, but the worst offender for both was the build quality was nowhere near as nice as the M! The M feels like a quality product, it's solid as a rock, has easy to use menus, a super responsive and beautiful touch screen and just great general fit and finish, oh, and it can use my EF glass! Win!
After the firmware update I have zero issues with my M and I honestly think people that continue to bash it either haven't used it (or the competition) or they have unrealistic expectations for a $500 or less camera (I do think the original asking price of $800 was way too high though, that I'll give people).