The only real difference between a monitor and television is a TV has a built-in tuner, among other things right? I think a lot of what are you are stating is conjecture rather than actual experience.
My TV is not designed for use with a computer. It has no VGA port. I use a DVI to HDMI cable. My TV also has overscan which crops off the top, bottom, and sides of the image. Fortunately I can compensate by adjusting the display settings on the computer.
Screen real estate is not important within the game. At 2560x1440 you end up with an incredibly small interface. Since my TV has a native resolution of 1280x720 that's the resolution I run the game at (the resolution SE recommends). You then increase the "General Draw Quality" to 9 or 10 to improve overall appearance. GDQ at 9 or 10 will increase the quality of the DoF effect considerably.
2560x1440
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1280x720
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