Depending upon the character creation rules you might have a scenario where instead of making a ranger the optimal choice becomes customizing your fighter to make him more ranger like same thing with your paladin or rogue. If the fighter is superior to the other melee classes how do you protect those classes without making the fighter the guy who can only do athlectics endurance intimidate etc?
That's an interesting question.
They said that they're basing the game on the assumption that every character should be at least competent at what they call "the three pillars of the game": Roleplaying, Exploration, Combat.
So, now, say that the fighter is great with every weapon and every combat style. He's, however, only decent at intimidating stuff, and he's a good tracker, but can't make a survival check for the life of his ( literally).
Conversely, a ranger might choose to be a great archer ( and mediocre with a sword ), to be as good as the fighter when it comes to scaring people, and has enough resources to be a great tracker, to survive just about any environment and to give the party a boost to their travel speed all day long, (while, for example, a rogue would be slightly worse at combat than your average ranger, great at bluffing, intimidating and diplomacy and pretty good as a scout, and so forth).
In the end, I'd say that it depends on how you see a ranger... if you think a ranger is a fighter with some woodsy skills, then yeah, he'll probably be better represented by a fighter with a background; if you think that he's a scout that's really good at fighting, however, you might not have the resources you need to model him if you start off as a fighter.