Well what is there to say... I am glad there are so many reviews out there that make such a big deal about certain "flaws" this TV purportedly has; not because this swayed me from buying the TV, but instead because it made them seem so insignificant once the TV arrived...
Let us start with the obvious, this TV is absolutely massive. People displayed on the TV are literally life sized and in some cases larger. That being said, I have this TV in a fairly large room, however, it is a rather odd shaped room and the seating positions have to be altered accordingly, so for all intents and purposes I will call this room 12x13 (These are the dimensions of the room if you were to outline around where the couch has to be, all the way around to where the TV has to be). This places viewer's heads about 9 feet from the screen when seated. What I can tell you is this is absolutely fine when viewing HD content, be it off a cable box, computer, or Blu-ray, there are many that have commented "you need to sit at least X feet away from the TV", some claiming 12 feet or 14 feet; while I cannot speak for these people, I can assure you at 9 feet HD content looks great.
THX has a formula to calculate the best viewing distance for a given TV (assuming you are viewing HD content) the formula is screen size divided by 0.84. So for this TV, 92/0.84 = 109.52 inches, or about 9.13 feet. That being said, standard definition content is not so appealing at this distance... Technically you would have to be about 20 feet away for standard definition content to look good... but who watches standard definition on a 92 inch TV?
The next big gripe about this TV was the reflectivity of the screen, the reviews I had read had me quite worried about this. For this I have good news and bad news, the good news is it is not nearly as reflective as some made it sound, the bad news is that it is still fairly reflective... The easiest way to put it is this, if you are coming from a matte display such as an older Mitsubishi DLP or certain LCD/LED's this display is going to seem extremely reflective (which is why I assume so many people complained, they likely were used to these completely anti-glare displays). However, I came from an older plasma TV (a Pioneer Elite) and the display on this Mitsubishi is no more reflective than the display on my old Plasma. To give you a good comparison that you can view in case you can't find this TV in a store, the display is about 30% LESS reflective than a standard glossy laptop screen (which is what I was expecting based on reviews). In other words, standard room darkening blinds will be more than enough to prevent significant glare while the TV is on. I have also viewed the TV with the lights on in the room without any interference as well. While the light will reflective off the TV a bit, it is something you will get used to to the point where you will no longer notice it (I was already used to it from my old plasma) and it certainly won't block you from viewing the content on the screen.
The colors on this TV are great, though they may need some adjusting when you get the TV. I personally have a low cost monitor calibrator that I used on the TV, it basically tells you what to adjust and you just make the changes in the menu. The only problem with the one I had is it was based on a 3 color display (RGB), this TV has 6 colors, so if you can find one that can handle the 6 colors it may make things easier. For most people the stock settings are probably fine and no calibration is needed, some people are just a bit pickier.
Brightness and Contrast... While the television may not be as bright as some of the newer LED/LCD TV's on the market you have to keep a couple things in mind... The first, it is 92 inches, if you had a 92 inch LCD TV, I can bet it would be significantly dimmer than its 55 inch brethren from a simple standpoint of power... It takes a lot of power to light up a screen that big, companies have to meet EnergyStar standards and that is not always easy... The second, the point of a DLP tv is to replicate a movie theater experience, when is the last time you went to the movies and got blinded by the overly bright screen? Regardless, the brightness is more than adequate, though if you are looking for brightness it does benefit from turning off the "energy saving" option in the menu; just keep in mind if you do this the bulb will burn out quicker and you will be using more wattage to power the TV (I am not entirely sure of the numbers). The Contrast on the TV is very good, though I have seen several Matrix Backlit LED televisions that have deeper blacks, but that is part of the Matrix Backlit LED technology, being able to dynamically turn off/darken individual sections of the tv to gain deeper blacks. The WD-92840 certainly has better blacks than most LCD/LED TV's on the market and is fairly on par with most high quality Plasmas.
The last thing I will mention is the viewing angles. Common to all DLP TV's this one is no exception, if you stand up while watching the TV you are going to notice a significant change in brightness, the same applies to walking to the sides. The change is more noticeable when standing up and sitting down than when moving from side to side, though it is apparent regardless. Similarly when sitting in front of the TV you may notice the middle of the screen is brighter than the sides, this is common to all Projection based displays, if you can't stand that, a DLP TV is not for you. That being said, it is not the worst thing in the world, if you are standing your eyes adjust to the brightness, the only time you notice is in the act of actually standing up from a sitting position, or the reverse.
One other comment, if you are going to get a stand you really want to look for one within the 12-14 inch height range. For me, while sitting on the couch, a stand that is 12 inches high raises the TV exactly enough to have the middle of the screen at eye level.