If you mention [an opinion about anything] for whatever reason, certain members of the community will lynch you for having an opinion.
/internet.
RF isn't bad by itself. its that too many modders are jumping on its bandwagon due to its simplicity of use for the player, and for some, the fact they don't have to write their own unique power system is a huge plus.
but not helping is some players (and some modmakers to be honest) tendency to treat RF as a FOO strategy- its so easy it beats out everything else.
this hurts those players though, by denying them the exploration of other power systems and mods that arnt easily RF compatible.
since its been mentioned earlier, Pnumaticraft has a interesting mechanic of its own. though I haven't gotten around to messing too much with it, I do not want to see it go.
IMO, more mods should have their own, unique power system instead of all jumping onto one.
however, care should be taken that complexity is for the sake of depth and overall enjoyment, not complexity for its own sake.
two biggest poll options at the moment are "thought and care required for best results" and "dangerous if done wrong", which makes me a bit hopeful.