Google+ is still in field trial mode (not even beta yet), with only a limited number of users testing the product.  And that's a good thing, because it's far from perfect.

Vic Gundotra, a senior Google executive, admitted on his Google+ page that there was lots of criticism for Google+.

For example, he apologized for the spam of notifications that flooded Google+ users on Saturday afternoon.  Gundortra explained that it was caused by the lack of disk space due to overwhelming demand.

Other complaints about Google+ include the inability to completely block a user, bugs with the stream updates, and trouble with the instant upload function.  A whole page of Google+ problems/complaints can be found here.

One user on Gundotra's Google+ page said he had trouble figuring out the service when he first started.  Others posted many questions on how to perform basic functions.  Google+, it seems, may not be the most intuitive product, even for a (presumably) tech-savvy field trial crowd.

From its past failures (e.g. Google Buzz), Google knows that Google+ only has a limited window to gain mass adoption once it's publicly available.  Having problems, especially when it comes to privacy, will stir a storm of backlash that could kill the product before it even gains a foothold in the social sharing world.

Google's decision to keep Google+ at field trial status, therefore, isn't just a marketing ploy to generate a buzz. 

So far, Google+ users seem to like the service and appreciate executive like Gundotra taking their feedback.  Many of them also understand that field trial products are expected to come with bugs. 

Apologies accepted,

Thanks, Vic,

I expect some bumps. So far it's great,

Thanks for reaching out,

and That's what happens during a field trial I'm glad to be a part of it were some of the supportive comments posted on Gundotra's page.