Why the stink? They weren't using him. Given that being a pro quarterback is a matter of style of offense, more than it's a matter of athletic ability, it's true that he wasn't an NFL quarterback.
Why the stink? Because Bledsoe sucks and plays like he has cinderblocks tied to his feet. He was losing game after game for us and not MOVING. Fans here were sick of it and saw the very mobile and crafty Michael Bishop as the solution. However, it takes more than mobility to play QB in the NFL. And that stands for 'Not For Long' if you don't have ALL the tools.