at fear of being called elitist, most people who want to play Rangers just want to play Fighters with a bow.
The unique part is.. The Ranger
1) has High skills
and
2) has magic to not play honest
The different between a druid and the ranger is the ranger's skill modifier and attack modifier is (supposed to be) much higher.
It's easier to see in 3e.
The 3e ranger had more skill points and more class skills than the druid.
When the rogue tracks, they have a large modifier and can defeat te high DCs. But when they hit a river where the tracks end. GAME OVER. The tracks are gone.
When the druid can tracks accross a river by wildshaping into a dog and sniffing out the trail in the air., they have a large modifier but their modifer is low +4.
The ranger can cast scent and track over water. With their +10 to the check.
But it hasn't always been that way, so I'm a little confused why it's "supposed to be" this way. I get that people would like that to be the case, but it was really only true in 3e. In 1e AD&D, the Ranger didn't have skills as we know them outside of Tracking (Druids, meanwhile, possessed "the druid can identify plant type, animal type, and pure water. He can also pass through overgrown areas such as tangled thorns and briar patches at normal movement rates without leaving a trail.").
And the 1e Barbarian actually had a host of special abilities the Ranger lacked, such as climbing trees, hiding in natural surroundings...heck, I'll just copy what Unearthed Arcana has to say:
As you can see, many of the abilities one associates with the Ranger are actually Barbarian abilities, and part of that class fantasy! 3e did Barbarians a disservice by taking away their superior ability to survive in the wilds and replacing it with "grr am angry", IMHO.
In 2e, the Ranger didn't have any more proficiency slots than other Warriors, and again, only had Tracking (which anyone could do, but carefully reading the rules showed that the Ranger was vastly superior to this than anyone else, since non-Rangers took a hefty penalty to Track) as well as Hide in Shadows/Move Silently (halved when not in forest terrain).
In 4e, the Ranger had no special skills either.
Technically, even in 3e, Tracking was a Feat, so anyone could acquire it, and you could easily make a non-Ranger who could Track just as well just by taking the Feat (Druids, for example, had decent skill points and a higher emphasis on Wisdom, not to mention a +2 bonus on the checks as a class feature!).
So why this class fantasy of the Ranger being this great skills guy who is better than anyone else at tracking and outdoor survival exists is a bit odd, since historically, that has almost never been true.