There was a lot of buzz heading into Facebook's F8 developer conference. But one day after the highly anticipated event, reviews are mixed.

Facebook drew praise from The New York Times, which lauded the social network's ambitious bid to take ownership of the emerging data portability issue. Dubbed Facebook Connect, the new tool allows independent websites to let their users enter Facebook usernames and passwords. If successful, the new program could make Facebook technology and applications the guts of an increasingly decentralized web.

But not all those who attended were impressed by Facebook's conference. TechCrunch blogger Michael Arrington slammed Facebook, saying he was "more than a little let down by Facebook's product focus and ability to execute."

"Today they [Facebook] were not bold, and they did not act like thought leaders," Arrington wrote. "There was no controversial or exciting new product experiment unleashed on a gushing audience. Instead, there were minor tweaks to a platform that needs a major overhaul."

One of those minor tweaks was a three-tier ranking system for Facebook's plethora of apps. However, it's not clear that a ranking structure will help ease congestion in a rather crowded apps ecosystem. 

Arrington also criticized Facebook for not announcing a payment platform, something that many had thought the social network would do at F8.