Big Reactors was planned to have some more balancing features, but they never made it. Eventually the reactors and turbines were supposed to explode, or otherwise fail catastrophically, but it never happened. Turbines have a tooltip about failing if overspeed for too long, but A) there was no point to going over speed because it produced less power than the sweet spot, and B) nothing ever happened. And C) it was too easy to put it in the sweetspot and keep it there forever.
Yellorium was also both incredibly common, and oredicted with IC2 uranium, which was also very common. Deep Resonance goes a bit the other way, by making it's ore pretty uncommon, which is fine, but also requiring nearly half a stack to make anything of it, and then requiring crystals to improve it beyond the basic 85/10/10, which is also fine, but after you've used all the natural crystals, you reach a point where you're forced to burn weak crystals, generating lots of pollution to get burnt ones to fuel the purification of other crystals.
Frankly, I'd rather just pump out biodiesel and get a steady 4096/t, then build a huge elaborate refining system that'll end up going dormant because I have nothing to feed it. That's just wasted resources.