Because you've only had it, what, a month?
Seriously, if you think that 2.2 is nothing but a headache then you haven't read a lot in the forums - those of us with it working correctly love it except for a few poor moves made on Google's part, and now VZW is releasing the new 2.2 update (I suppose you can call it 2.2.1) which you need to have 2.2 on your phone in order to have installed.
I have posted time and time again that the original update that patched your 2.1 system files to build 2.2 had issues to begin with, and a lot of people are finding factory resets and / or re-applying the master 2.2 update on their phone to be problem solvers.
however, you also have to realize that all your apps were installed under 2.1 and the system patching does not account for app instability in 2.2 - there is no application compatibility checking performed.
The choice is yours - but even if you go to 2.1 you'll be starting from scratch - there is no way to keep your apps installed and revert.