This isn't specific to the talent of Todd Gurley, Rob Havenstein, Jamon Brown or Sean Mannion. But in their overall statistical view of the relative value of their position groups, here's how the Rams' draft stacks up so far.
Notably, first round running backs and second-round offensive linemen tend to produce the best results for their position group. Those third-round quarterbacks though... yikes.
If you're interested in the full list of 3rd-round QBs, here it is. Along with the dregs, there are some interesting names on there, including Joe Montana, Russell Wilson, and ... Nick Foles.