A few more thoughts and observations- mainly, it seems the best "A/V Mode" for anything on this TV is "Game". On all other modes, text in the picture looks a little jittery- hard to describe, but the effect is the same as viewing text on a CRT display. (It appears to do this mostly on HD-DVDs, the Blu-Rays I checked looked fine so those who don't have HD-DVD players may not notice this.) I could not find any individual adjustment to eliminate that except to put it on Game. I assume that mode bypasses most of the extra processing the TV does, which usually ends up doing more harm than good. Last night when checking digital broadcast TV stations, I noticed the "soap opera effect" on filmed material when going in and out of the TV's menus, even though I already had all 'motion enhancements' set to Off. I will have to see if Game mode stops that. (On Game mode you cannot even turn on any 'motion enhancements'.)
I knew about the auto-dimming going in, but it's still rather annoying. Checked out the openings of some movies and even in a bright room you can tell when the backlight is dimming itself when the screen goes to black. Decided I could tolerate this before I decided to buy the TV, but still wish there was a way to disable this 'feature'.
What's interesting is this TV senses when there are any closed-caption or Text signals on analog video. (Text is extremely rare- it places text on the entire screen in a black box blocking out most of the picture. ABC used it in the 80s to show program listings and a news feed, but I haven't seen it used since the 90s. Some TVs can't even display it, I found this TV can when playing a Mitsubishi demo laserdisc which does have info in that area- ironically it's a repeating message saying "There is no Text info on this disc.") If there's no captions, pushing the CC button won't even let you turn them on- it displays a "--". If there are any, it lets you turn them on, and in the rare cases when there's something on CC2 or Text it lets you turn those on too. The text font this TV uses for captions is a little unusual compared to other TVs I've had.