Got a 65" X900H in over the weekend. The low, low number of local dimming zones almost scared me away, but all other aspects considered -- and after getting an extended opportunity to play with one in the store -- I took the plunge.
I haven't had any issues with game mode looking dull, but I am coming from a 10-year-old plasma that I dialed down fairly far to prevent burn-in. I've never seen anything as bright as this TV can get, and it's not even one of the brighter LCDs on the market. To be frank I left almost all of the color and contrast related settings at default, except for brightness which I set at around 20-25. I also set Local Dimming on High. I had heard that this crushes shadow detail at times, but I ran tests comparing High and Medium on various dark scenes and didn't notice any real loss.
Bloom isn't noticeable to me except in extreme circumstances (like the loading screens you mentioned) where I feel like it's minimal. That said, I notice that if I step even two or three feet off-axis to the left or right of the screen, the bloom suddenly becomes hideously noticeable. The viewing angle on this set is really, really narrow if you want the best picture quality. Doesn't bother me at all as I am usually the only one using the TV in a light-controlled room.
