- The display is unreadable in sunlight. If you like the outdoors, like I do, this is a deal breaker. (If you're a vampire, read #2)
- The buttons along the bottom of the Nexus One do not work. Or rather, do not work all the time, which is actually worse from a usability standpoint.
(I can't help but wonder what this implies about the Google culture and possible vitamin D deficiencies there.)
As for the second point, well, the buttons gotta work. Every time you hit a button and it doesn't work, your expectations are blown, and you cause feelings of fear and anxiety in the user. They are small feelings. But they add up. Eventually, the user is all but flinching before touching a key. They look for ways to avoid touching the offending keys. This is usability 101. But you have to stab, cajole, pray, and otherwise beg the shitty Nexus One buttons to register a tap.Absolutely unacceptable. Apple has shown how to do great touch UI with an absolute bare minimum of buttons. The back|menu|home|search buttons on the Nexus One are worse than useless: they actually eroded myexperience to the point where I just don't want to use the phone anymore.
And since point 1 rules out all users except vampires, that means point 2 is going to mean Google has to deal with a lot of pissed off vampires. Maybe someone can get Stephanie Meyer to chronicle the inevitable vampire assault on Mountain View. In the meantime, I'm selling my Google stock.
I'm sorely tempted to eat the $45 restocking fee and return the thing, but I need an Android device for a business project (which doesn't rely on the display, luckily). So I'm gonna keep it, but I'm not gonna like it.
(For the record, there are three good things about the Nexus One: Google Voice, Live wallpaper, and strong syncing tools. And, to be honest, when you turn the brightness all the way up the indoor display is quite fetching.)