Yeah you do tend to get some bloom in the corners on a black screen in a pitch black room. I think I have previously mentioned the slightly uneven backlighting in some conditions. Unfortunately it's the nature of the technology. If you want a completely uniform 'backlight' at all times, then you need plasma, but then you have to accept the compromises that come with that too. I would say this is pretty much the only criticism I could realistically level at this TV.
There appears to be a range of colour that shows this effect more. Mostly when it's displaying greys I think. Blacks are very very very black, but can still show some blooming in the right conditions. For me, overall, it's a compromise worth accepting given how strong the TV is in every other area. I'm not disappointed by the blooming, but I am aware that it is sometimes noticeable. KNocking the backlight intensity down helps, and will almost eliminate it. I have my backlight down to 6, which seems very low at first but is actually far more natural looking. More plasma like in terms of brightness, and I personally cannot stand overblown colour and brightness that most TVs ship with as standard. Calibrate it as per these settings;
http://www.facebook.com/photo.php?fbid=197575220286861&set=a.197575200286863.55803.110909255620125&type=1&theater&pid=529799&id=110909255620125
Try a backlight setting of 6-8. It will massively reduce the corner blooming, and is more than bright enough. Big backlighting just looks unnatural. Also, be aware that the picture settings are per source. You will need to enter the settings per input. In other words when you calibrate the TV picture, you'll then have to select HDM1 (for example) and do it all again. It's a lengthy process but it has to be done. You will be in awe of the images it will deliver once setup properly.
Yes I do use it for games and TBH I have not noticed any input lag. Game mode bypasses the noise reduction and disables the '800hz' motion smoothing frame creation stuff. I don't use it. I use the calibrated settings for all material.
Do you have Black Opps on PS3? You will be blown away by how good it is in 3D on this set.