My phone has actually lost functionality after upgrading to Gingerbread.
Hopefully someone else can confirm these issues I've run across:
#1 - Previously I was able to configure email notifications to be silent with the only notification being the flashing LED. Now it appears that I have to select a ringtone. I have three Exchange Activesync accounts setup along with my Gmail account, I'd rather not have my phone dinging all day with each new email. (Am I just missing something here?)
#2 - When using the keyboard with email or text messaging, I can hold down the period key to bring up the alternate characters but cannot select any from the bottom row.
#3 - Exchange Activesync intermittantly fails with an "Invalid Server Certificate" error however hitting "Retry" usually seems to then sync again. This is with both an Exchange 2007 and Exchange 2010 environment and with two different certificate CAs.
#4 - Google Reader now hangs all the time to the point that it's unusable. After popping in and out of a few RSS feeds, I get the little loading wheel and it seems to spin forever.
#5 - Navigation within Google Maps has been buggy and locked up multiple times. Several times it seems to have occurred when switching from portrait to landscape; the screen becomes distorted and hangs for about 15 seconds or so.
#6 - Battery life is noticable decreased.