My biggest beef with AMOLED displays is that they require more power. True, at all black they consume less, but in normal use it's more compared to LCDs. I just got a Nokia Lumia 800 and I'm down to one day of battery instead of two with the iPhone 4. The same issue was present with my previous Nexus One. Displaymate did a test to quantify this: http://displaymate.com/Smartphone_ShootOut_1.htm
Also when displaying text you are more likely to notice the pentile pattern which makes the text unclear at small sizes. Granted, it may not be a problem at 316 ppi of the Nexus, but it's noticeable at 252 ppi of the Lumia 800
Also when displaying text you are more likely to notice the pentile pattern which makes the text unclear at small sizes. Granted, it may not be a problem at 316 ppi of the Nexus, but it's noticeable at 252 ppi of the Lumia 800