3. The curve creates subtle geometric distortions. The most prominent is the slight bow-tie shape, where the edges of the screen seem larger than the middle. It's most noticeable on letterbox bars and other content with horizontal lines that stretch across the screen, but again, it's not that obvious from the standard position/distance.
As I moved off-angle, the distortions increased. The near edge seemed larger than it should be, and the middle to far middle seemed too small, before growing again at the far edge. A flat TV also has its own distortions, of course, but to me the ones on the curved TV were slightly more obvious.
2. The impact of the curve on the picture is subtle, and it provides no increase in immersion. The curve can be obvious in person and especially in images and video shot from the sides and above, but when you're watching it from the couch, it basically disappears. At my house, I asked visitors watching the TV whether they noticed anything different about the new TV, and nobody mentioned the curve.
In no case did I notice the increase in "immersion" supposedly brought on by the curve. The image seemed no more immersive than any other 65-inch TV, either in isolation or in a comparison lineup.
Just like 3D TV, curved screens at home screen sizes are a face palm. Maybe if we all had Cinerama or 2-4 story building IMAX screens, then you'll want curved otherwise, the only good thing they have done like 3D TV is reduce pricing of non curved TVs.
I just bought an LG 65ef9500 (OLED) and the 3d is amazing. I didn't buy it for the 3d aspect, but it is pretty cool, and will be watching 3d movies with it.
as far as the curves go, if you had a 70"+ display, I would say maybe. OP is probably refering to LCD panels which have horrible viewing angles as it is, so realistically the curve isn't going to be much worse for off axis viewing. if you like it, go for it.