Now, that said, I still stand by my supposition that it's better to distinguish the class, rather than force it into everybody's concept. Latitude to customize is great, but when you come down to it, a base class has to fit a role. The ranger's role, from the dictionary definition on down, is that of a scout - an informer, and a pre-empter.
The new ranger fits that very well. He's not the guy who sticks around in the front line - that's the barbarian, paladin, and fighter (and really not even the paladin, who seems to perform better on horseback than on foot.) Instead, he is the one who sneaks in, observes, informs, and leaves - but who can fight if he needs to, enough to escape his situation. His skills, spells, and class abilities are based on it.
This is similar to, though different from the rogue. The ranger is more independent than a rogue, whose skills depend on interaction with civlization more often than not.
It's different from the fighter or barbarian, who can wade into combat, but who has little ability to do reconnaisance.
THe loss of medium armor proficiency is a minor change, and to me one that fits the archetype. Legolas can strap on heavier armor, as can aragorn - but they didn't wear it by default. Does this mean they were even proficient in it, or comfortable in it? Not necessarily (someone who knows the books better than I could answer that). But their use of it once or twice in an entire trilogy does not imply proficiency. Frodo used a sword against the Barrow wight - it didn't mean he was good at it.