personally, i do i think favoured enemy('14 version) and favoured terrain should be the ranger's 'unique' baseclass feature, they're good concepts they just need to be executed better, just don't make them inert non-features when dealing with anything other than your specific pick, undead are your favoured enemy? congratulations you get resistance to necrotic damage, expertise in religion and a handful of cleric-y and radiant spells, your favoured terrain is jungle? well then you get resistance to poison and disease, an improved climb speed, immunity to difficult terrain and herbalist's kit proficiency.