The existence of the phenomena known as "overtraining" has long been debated, and with great passion. Some argue it's a real event with a biological basis. Others argue it is a phantom, a figment of the mind. Some lifters grow like weeds with a more "minimal" training routine. Others only flourish when they hammer out set after set after set. If your approach works, good for you. One man's meat is another man's poison. Just keep in mind the validity of the term may be influenced by your approach to lifting and what your ultimate goals are.
For one such hotly debated discussion: http://forum.animalpak.com/showthread.php?t=2197