A major flaw in RET is it's sole reliance on gravitons as the only mechanism to explain gravity. The problem is, RET's gravity is a function of mass and distance. Therefore, gravitons must be affected, somehow, by both mass and distance. However, it is affected by neither as any graviton source will distribute an infinite set of gravitons at an infinite rate to all matter in the universe. How? Read on. (Guess it's just us FE'ers from here on)
An atomic particle (not a neutron/proton, but whatever is actually an atomic particle) emits gravitons. It emits them in all directions. It emits them at a rate that is indivisible. It therefore emits infinite gravitons (all directions), at an infinite rate (indivisible rate).
A clump of two atomic particles, emit double infinity gravitons, at double infinity rate.
These two sets of gravitons reach an atomic particle at some distance x. How is mass and distance communicated by an infinite set of stateless particles? How does it know that the second set of infinite gravitons should have twice as much influence? If the distance were 2x, how is it this distance communicated when the particle still receives an infinite set of gravitons?