Plasmas garbage? No. They're the top tech at the moment for video. The problem with them is image retention and possibly burn in, caused by static images over long periods, such as the score counters and HUDs in a game. LCD doesn't have that problem. I think plasmas may have more lag as well, although I'm not really sure about this. Lag isn't an issue with video (provided the audio circuitry compensates to keep things in sync). It's a big problem with action games.
I don't know which LCDs are best for gaming right now. Look for the best combination of quality, resolution and response times (measured in milliseconds).