Not necessarily true. A slightly more complex system doesn't necessitate that it provides more gameplay value. Just that the gameplay is different. Nothing less or more.
Is that the fault of RF itself or of those implementing RF, hmm?
RF has become the new MJ. The new popular power system, so it'll attract more mods. More mods means more variance in quality and efficiency. It's wrong to blame that on RF. Blame it on the mod in question instead.
Also, there's a difference between server performance and client performance. Those graphics/animations/sounds? Most, if not all, are client only. Doesn't effect the server.