What are projectors' shortcomings?

[Travis]

1. What will we hate about having a projector?

2. What is a TV better at than a projector?

I can accept the bad if the good is great. My first projector is Optoma U3(DV11 in USA), has built in DVD and speakers; I bought it for work. Brought it home to play with and loved it ... at first.

This is not the best projector, it is SVGA and brightness is not high, contrast seems okay. However, I don't think I can use it to honestly critique 1080p projectors. Before I rush out and drop $2,000 on a 1080p DLP projector, I need to know the downside

3. How is the black level and color?

My Toshiba LCD looks better with the lights on which annoys me because I like movies in the dark or in just a low light. Also it doesn't have the best black levels.

4. Any problems with placement of projector, that can't be fixed? Problems due to height and angles?

My Optoma on a table and is pointed up at an 84" screen. I had to use the keystone correction quite a bit. After I squared up the picture, I had some space on the sides of the screen. I just moved the projector, so the movie fit the screen, but then some light is shining on the wall. If I get a new1080p PJ and mount the projector on the ceiling what problems do I face? Any problems caused from screen placement too? How about framed or pull down?

I understand, it is apples and oranges, and there are so many factors, LCD, DLP, 720p, 1080p, 800x600, lumens, ambient lighting, seating etc. For arguement's sake, what do projectors do badly? Like LCD TVs have lower black levels than Plasmas. It's just a fact. Not just looking for fats also want opinions. What do you hate about owning a projector?