We are out of Beta so I am guessing it isn't considered bug.
http://goallineblitz.com/game/forum_thread.pl?thread_id=5040849
http://goallineblitz.com/game/forum_thread.pl?thread_id=5040849

...the MLB is now basically a backup for the defensive linesmen ...it sort of renders QB Spy ineffective, unless the QB is rushing up the middle, but am still unsure about what effect QB Spy has for being used by outside coverage ...am just basing this speculation on how QB Spy used to react, as dots used to hover towards the middle of the field when using it