Lanefan
Victoria Rules
Which sounds even to me like it'd involve a lot of DM-wrangling on the part of the player, to slowly expand the 'related' strike zone such that it applies often enough to be relevant.Natural Explorer is expertise in Perception and Survival. It's also expertise in Nature, Animal Handling, Insight, Medicine, History, Investigation, and Arcana so long as you have the required proficiency first.
The caveat is needing it to relate to your favored terrain. The good news is that it easily can if you're aware of what "related" means.
If you face a hobgoblin and need to make an insight check in the artic but your favored terrain is desert, you still get the expertise because hobgoblins are naturally related to desert environments. If you need to craft a trap, so long as it relates to your favored terrain, the skill check required for it still uses expertise.
It's an important distinction that the expertise don't activate when its in your favored terrain, it activates when its related to your favored terrain.
I'd far prefer the Ranger to be good at fighting - as good as a non-specialized fighter - with the tracking and exploration pieces tacked on. Then, when the Ranger's in the woods she can be very useful and the rest of the time she's still a reasonably competent warrior. Open up all armour and weapon types to the class, tone down the spellcasting (or delay it until high level), get rid of the pets (which, if any class must have them, make more sense with Druids anyway), and make Con its prime stat.
For added fun, and to give the Ranger a niche to call its own, one can add the concept of magical herbs to the game. Rangers are by far the best at finding them and in many cases are the only ones who can successfully apply or use them. And there's tons of design space for what herbs can do - curatives (all kinds), hallucinogens (which can verge into divinations), poisons, nature lore, woodland-creature summoning, etc., etc.
There was an article in an ancient Dragon magazine that vaguely waved at this concept. We've homebrew-expanded it greatly since then.