Yuneec does make some pretty good products, for those that take the time to learn how to use them. They are also much less invasive of your personal and professional privacy than DJI.
Although there are numerous reasons some have become disappointed with Yuneec, the short version is they are slow to respond to market demands and customer requests for product improvements. They also fail to communicate any of their forward planning with their customer base.
I was a pretty dedicated 3DR flyer right up until they ran afoul with the Solo. Fortunately I held off that one and didn’t get wrapped with a product you now can’t buy batteries for. On the up side is all the 3DR products I had and still have, all still function perfectly and receive periodic improvements through the Ardu community. Funny thing, with the exception of the Yuneec gimbal and Tx display screen, they all can deliver more flight functionality than anything Yuneec has produced.