"Good" is a relative term.
What some may consider "good" other may call them "bad".
For example, many gamers love LCD monitors built around a TN because they are inexpensive and have "fast response" times.
Other people like me would toss them into the crap bin (every single one out there). Why?
1. Poor color accuracy.
2. Poor black levels.
3. Limited viewing angles. Even starting straight at the monitor you can notice color variations between the center and one of the edges.
4. Seemingly more backlight bleeding than most other types of LCD panel techs.
Basically, all LCD monitors have florescent lights behind it which is always on when the monitor is turned on. TN panels tends to let more of this backlight shine through than other panel types.
I tend to spend more money on "better" panel techs that have marginally slower response times, but overall color and image quality is "better" than TN panels.
Click the 2nd link I provided above for more technical info to understand what I am talking about.