It's a simple problem, and mostly is unrelated to the bugs.
One day you're a good pilot, racking up easy kills. You get used to it, you get used to not dying. The next day you're no longer able to hit anything, you die repeatedly for stupid reasons, to people who already know how to deal with the new system.
It can be terribly frustrating when "I'm a good pilot" becomes too much a part of your gameplay, and suddenly the people who took the time to play the beta have a huge advantage over you.