That is not true. Bulldozer is very good in multithreaded workloads and bad in singlethreaded workloads. Whether it is a failure or not depends on what you want to do with your computer. For server-like work (virtualisation) or encoding and formating, it is arguably better than a 2600k from Intel. Of course, there are more things to consider, since you don't just choose between two CPU's, but between two platforms.
Writing off FX as a failure is a very bigoted and probably biased thing to do. Hence, I would not listen to posts about FX which start with "OLOLOLOL FAIL!!"
Think what you want your PC to do and decide.
You also might want to wait for a stepping update on FX if you have time.