Is this a good fantasy baseball trade?

Yes a very good trade for you. Bourn and Ellsbury are similar players. Ordonez is gonna get things turned around and be the same productive player and can easily replace Granderson except for the speed which Granderson doesn't utilize enough. And you get 2 good pitchers for free. If there is a big difference in the production you are giving up, your pitching staff will definitely be improved. Good Luck :)