Overall, I can't complain.
Infiniti notified me of a recall/TSB to rectify a potential ground issue that may result in inadvertent airbag deployment. We discovered that the "fix" required puncturing holes in the steering wheel cover, and that the marks were permanent. We objected, and the dealer contacted Infiniti corporate, who authorized replacing the steering wheel. It took a couple weeks to get the parts.
We experienced a loss of AWD function when it rained. This was a big concern for me, as AWD was an important feature. We took it to the dealer twice. The first time it was dry and they said they couldn't reproduce it. After the problem re-occurred we took pictures of the warning lights, and we took it back to the dealer. We were polite, but insisted that the issue needed to be addressed. The dealer gave us a QX70 loaner (nice) and agreed to keep the vehicle for several days. When we came back to pick it up, they had a thick stack of diagnostic paperwork, which they walked us through. They ended up spending considerable time with Infiniti tech line, and on their advice replaced the ECU. We haven't had the problem re-occur.
We have an intermittent issue where the backup camera sometimes does not display -- the screen stays black. We haven't asked the dealer to look at this, yet.
So, I empathize that this vehicle can have some issues. I half-expected some of this when I bought it, knowing that it is mechanically a Mercedes GLA with an Infiniti infotainment system retrofit inside. So you end up with a product that has the problems of both platforms, plus some new issues introduced by the integration. However, I must commend Infiniti and our local dealer. They've done a good job taking care of us.