Certainly not all widescreens are as bad as the 215TW. My 2007WFP is both quick in terms of ghosting/texture blur, and has minimal lag, to my eye anyway. I'm sure the 20" NEC with the IPS panel is just as good if not better too.
There are a few other areas where my screen is inferior to a quality CRT, like black depth and tearing (through running at 60Hz), but it's certainly quick enough to play some quick games on though. I've played UT2004 instagib deathmatch on it, GTR2, I'm playing GRAW at the moment. It's performed very well in all those.