Try if you like but from personal experience you won't enjoy it. Having used my tv a http://www.bigbrownbox.com.au/panaso...ull-hd-plasma/ to play some D3 for a laugh and a bit of wow I found it not a great experience.
I don't like to run games on my 42" 1080p LED-TV, can't imagine one being happy to do so on a 720p plasma... It might be enjoyable on a really really good TV, but I honestly can't see myself throwing that huge amounts of money at a TV. My main-screen being a 23" 120hz LED, might kind of explain why TV feels awkward. Though, it's all about personal opinions, even if I couldn't understand the point.
edit: I do quite often set my 42" LED-TV as secondary (cloned from my 23" screen to the TV) for my friends and/or wife to watch my games, for that it's more than enough but it doesn't really cut it for me to use as primary screen while gaming.