Well, I think I speak for everyone when I say I'd like to see the 3g issue fixed. Other than that, I can easily say this is one of the coolest gadgets I've ever owned.
I just came from a Blackberry storm, and it was a complete disaster. It was a failure from launch day, and I never had a satisfying experience for the year that I owned it. To think that I stood in line for such a glitchy, underpowered curve-with-a-touchscreen makes laugh. To think that I checked CrackBerry every morning when I when I woke up for an OS leak makes me want to puke. My Storm froze more times than I count. Battery pulls were a daily habit. I feel like I was swindled by Research in Motion, and they lost me as a customer forever.
Hello Google. Now I have a phone that does the most simple of things for me: it works. I know this may sound silly to those coming from a decent phone. But the fact that I can type with a moderate amount of speed without my phone starting to cry makes me feel spoiled. A 3g/edge issue doesn't bother me at all compared to some of the nonsense I put up with this last year. Everything else is icing.
Android as a platform just rocks my world, to put it simply. The synchronization between google apps and the voice-to-text in any text field have to be seen to be believed. I know what they mean now when they say a "Google-experience". I have the web at my finger-tips (and it doesn't take a minutes to load a full browser page).
I thought widgets were gimmick before I had them. Now I can't live without 'em. I ran out of space on my homescreen, so I slapped a couple on my Windows 7 desktop.
If I could see one area get improved, however, I'd like to see some better games in the app store. The selection is pretty dismal. I see some good work coming out of the guys who code the ToonWarz game, but not much else. Hopefully the multitude of Moto Droids out there light a fire under some devs. butts. But I can live without FPS's on phone. Really, there's so much else to do it doesn't bother.
I hope I'm not coming off as a fanboy, but after my experience with the Storm I'm more akin to vegetarian eating steak for the first time. I can't say enough about my Nexus One. I love it.