Respectively, I'm going to have to say that IPS displays aren't as nice as everyone gives them credit for. At their best they are vivid and have good color quality, but they're far from consistent.
I suspect part of this is the result of emulating brightness by being slightly washed out, but that's a different discussion.
When I was looking at various tablets I took the time to compare displays on the Xoom, Acer A500, and ipad 2. The IPS display on the ipad 2 had good quality in the center but the light level degraded on both sides and on the bottom for about an inch and a half. Very inconsistent. The center's vivid white quickly turned to brown as it approached the edge of the display.
By contrast the qHD displays that Motorola's rolling with lately, particularly on the Xoom and Atrix, while not quite as vivid, are very consistent. They maintain the same quality from edge to edge.