Update: some reviewers are actually very upbeat on the display. ABC says "it's got a better screen than anything out there right now", and Gizmodo thinks "This is probably the best screen we've seen on a smartphone so far",better than the Droid and iPhone screens.
"At first we thought Google had tweaked some of the Market settings because the highlight orange was so bright, but comparing images on the web across different displays, the Nexus One consistently looked brighter then it should have. Oh, and using this thing in daylight? Forget about it... The Nexus One is a nightmare to see with any kind of bright light around, and snapping photos with it on a sunny day was like taking shots with your eyes closed.".
When they wrap up the review, though, they say that the display is "vibrant".
This is a shame, as usually people are very upbeat on OLED displays. We also had reports that the new AMOLED displays behave better in sunlight, so this is a surprise, too.