The ranger class abilities are situational but the paladin can't replicate a ranger...
...unless the idea of a ranger to the player is just a warrior with Stealth, Nature, and a green hood.
The issue with the ranger is different from the issue with the sorcerer.
The problem with ranger is that many want to play "Fighters in green hoods". The 5e ranger is closer to the skilled wilderness warrior who uses nature and arcana to best beasts, monsters, tribal raiders, and the supernatural beings of the wild.
Favored Enemy and Natural Explorer aren't the best but they aren't as terrible as people say. The issue is some table don't run wilderness encounters in depth and some people just want to play Fighters.
The main issue with rangers is their number of small spell known. If Hunters Mark and Cure Wounds were free, it fixes a lot.