With so much hype at times brands and products fall flat on its face, and that is the case that we are seeing with Google's Nexus one, which is its first entry into the mobile handset arena, rather I would say it was Apple vs Google that made Google launch its nexus one so early in the year and is already making its customers feel the heat and is somewhat the fire has died, as there was so much buzz before the release of the product, but let us look at things why Google Nexus one is not creating that buzz?
Here's looking into what is troubling Google Nexus One.
1. Poor 3G connectivity seems to be one big sore issue among Nexus One users. According to reports, Nexus One switches back and forth between EDGE and 3G service even when strong 3G signals are available.

2. Another issue troubling Nexus One users is the device's customer service. Many of my friends who have bought this phone in abroad are facing serious problems interms of customer service, as there is no phone number to call for customer service, one has to drop mail to Google to which one gets response after 3 days, users are complaining that they have to shuttle between Google, device manufacturer HTC and network provider T-Mobile USA to sort their issues.
Usually mobile-related problems are directed to the service provider as in the US most people buy subsidised phones from a mobile operator. However, since Google is selling the phone directly to end-users, it has resulted in many users turning to the search giant itself. Also, Google reportedly appears to be only accepting e-mail customer queries, to which it pledges to reply in one to two days. On the forums, Google promises an e-mail response within 48 hours, but offers no telephone service.

3. Many users are also reportedly said to be facing problems in using the phone's touchscreen and difficulty in returning back to the home screen. Google Nexus One features a 3.7-inch (9.4 centimeter) AMOLED touchscreen display. However, the phone doesn't support multi-touch functionality.
4. With Google selling the phone directly to users through its website, many users have also complained about delivery issues. Many users wrote on Google customer forum that they didn't received order confirmation even after three days of placing an order. A user wrote that he is waiting for his order to be processed even after 72 hours.

5. Users are also reportedly facing issues with the battery life of Nexus One phones. The mobile phone's battery seem to be shortlived, with many complaining that it runs out of power in a day even with minimal use.
Though we all thought that Google will give tough competition to Apple's iphone in this regard, but I am very happy as a iphone user that still iphone is the top smartphone :)