I am going to ask you lot to tell me why NOT to buy the Smith & Wesson M & P 15 -22. Tell me all about the bad quality, the FTF's the FTE's, the unaccuracy, the ones that blew-up in your face: let's play the be honest game here.
I'm going to speak to what I know and not speculate on the rates of known problems you can sift through here...
The lower is not quite the same as a real AR. Sure, you can swap the fire control stuff, but things like the Magpul BAD and various aftermarket grips don't work quite the same. I wish it was more plug and play in this regard. Did they really have to tweak it out of spec so these kinds of accessories don't play as nicely? Why couldn't they have stuck to the correct external specs on the lower?
I'm not a big fan of rail grips, I can fix that somewhat with various products but not without spending a bit. It also doesn't match it's big brother since I don't bother with rails there. I'd actually prefer a regular handguard style and wish that was a purchase option.
I'm a bit nervous about the charging handle. It hasn't broke on me yet, but there's a reason I bought a beefed up handle for it's big brother. Maybe I won't have an issue, but I'd feel much better if I could order a replacement to have on hand.
Which brings me to parts. I wish S&W would make replacement parts readily available (maybe they're out there and I'm ignorant, but I haven't seen it yet). I'd love to have a spare BCG at a minimum...
Different behavior with different ammo. I wish mine was one that worked well on Federal bulk instead of the multiple FTF on each mag I see. It's nice that S&W told me that CCI Mini-Mags was more or less the official round, but it's a less economical round for me and this tool is about, surprise, the economy! Though this failing isn't unique to this product, I hate how ammo finicky 22lr arms tend to be in general. Seems like it's the rare model that eats everything, I happen to have a buckmark that does, but every other 22lr I've owned has definite and obvious preferences and my M&P15-22 is no exception.
I wish it had a functional dust cover. I guess I've never really needed it for my AR that I can remember, but, you know, it's that completeness factor.
I think that about sums up my reasonable objections.