Hi g,
Many features have been lost in Numbers 3. You can send feedback to Apple with Menu > Numbers > Provide Numbers Feedback.
And... playing the Devil's Advocate, have a look here:
Features that Apple has promised to reinstate:
http://support.apple.com/kb/HT6049
Hints on workarounds here:
https://discussions.apple.com/thread/5512949?answerId=23622372022#2362237202223622372
What has been GAINED in Numbers 3 is here:
https://discussions.apple.com/thread/5473882?start=75&tstart=0
What has been lost in Numbers 3 is here (with corrections where Apple has already reinstated some lost features in the Numbers 3.0.1 update):
https://discussions.apple.com/thread/5470448?start=240&tstart=0
I enjoy running both versions of Numbers (Numbers 2 and Numbers 3) at the same time. They each have strengths and weaknesses.
Numbers 3 did not replace your Numbers 2 (Numbers '09). Look in a folder called iWork '09 inside your Applications folder. And enjoy.
Regards,
Ian.