This is mostly correct, especially about black levels/contrast. Regarding refresh rate, Panasonic, for instance will claim some of their plasma's are 600Hz but the way they came to this number is that they divide their screen into 10 fields which are each 60Hz. 60Hz x 10 fields = 600Hz. They know the consumer will most likely just think the bigger number is better. So your plasma is really 60Hz, meaning the image is being redrawn 60 times in one second, which is not a big deal anyway since the content is only coming in at 24 or 30 times a second. But plasma's don't need a fast refresh rate since the plasma cells are already refiring around 1000 times a second, much faster that the image is being redrawn anyway.
The issue LCDs run into is that the LCD cells can't keep up with the times the image is being drawn. The LCD cells actually open and close to varying degrees to let light pass through and that is much slower than the chemical reaction of plasmas. The picture is actually being drawn at 60, 120 or 240 (faster than the source frame rate) but the cells are what is falling behind. The jump from 60 to 120 is a pretty noticeable improvement but 240 is generally not as much. They also came up with something called "interpolation" where the processor tries to guess what a frame might look like between two frames of content since they would be displaying the same image 4 or 8 times anyway (at 120 or 240Hz) and this can help on the fast moving stuff for when it catches the cells at the right time for them to refire. The problem is it can make weird artifacts on still shots with little motion. Most LCDs have the ability to turn off the interpolation (sometimes it has what ever weird name the manufacturer gives) and I would recommend having it on for say sports but off for movies.
All that said LCD's have improved quite a bit in recent years on their motion blur problems. I would probably go with a good plasma in my dark, movie watching basement room or mancave but would have no problem with an LCD in a brightly lit, window-filled living room area. They are much brighter and handle the brightness of the room better.
This was not specifically aimed at anyone just thought some might be interested.
