What to do with this fantasy football trade offer?

My roster= Brady, Rivers, AJ Green, J. Cook, A. Bradshaw, R. Wayne, Nixon, V. Ballard, B. Tate, S. Rice, Daryl Richardson, Donnie Avery, Greg Jennings, Cedric Benson. His roster= Romo, Flacco, Ridley, L. Fitzgerald, Olsen, Gonzo, Dez Bryant , Mike Williams, A. Boldin, D. Murray, D. Thomas, Jake Locker, Alex Green,... show more My roster= Brady, Rivers, AJ Green, J. Cook, A. Bradshaw, R. Wayne, Nixon, V. Ballard, B. Tate, S. Rice, Daryl Richardson, Donnie Avery, Greg Jennings, Cedric Benson. His roster= Romo, Flacco, Ridley, L. Fitzgerald, Olsen, Gonzo, Dez Bryant , Mike Williams, A. Boldin, D. Murray, D. Thomas, Jake Locker, Alex Green, Hardesty. He has offered to me Flacco, Boldin, and Gonzo for my Rivers, Cook, Jennings. Now I am no expert or rookie but this offer is lopsided, so my question is what would be a great counter offer if any or should I reject it without hestitaton. Thank you guys and gals.
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