We have 2 P22's in our family, my wife's and my father-in-law's. My wife's is the grey bodied one with the long and short barrel. My father-in-law's is a 5" black on black. Both work flawlessly but they have their quirks. First off, the early run had a bad designed magazine, make sure you have the "-A" mags. Second, the barrel is held on with a screw on end cap that works itself loose sometimes. Not a big deal you just need to check it about every 500 rounds (or when you're cleaning it). The compensator (not really a compensator, just an add on for looks) will come loose if you don't check it too. All of the loose issues can be resolved with blue locktight.
Overall the guns are a blast to shoot, quite accurate and very hand friendly. I bought a Neos U22 and put a red dot on it but the wife didn't like the bulk and after she shot her dad's P22 she was hooked.
BTW, we have about 500 rounds through our P22 with 2 FTE's and 1 FTFs' both related to ammo (cheap 525 Winchesters). The other has ~1000 rounds through it with roughly the same performance. Overall we are very happy with ours. I think some of the bad press is from people who don't know or aren't willing to take the time to learn the guns quirks.