I can't really do that in 4e, can I? If I want to be a ranger; I better use a bow, two weapons, or an animal companion or else my powers are pretty much reduced to basic attack, aren't they?
If you insist on building it with the Ranger class, then yeah... but if you don't want to do
any of those three things, you should be building your "ranger" with another class, and I don't see that as being a problem because the system is fine with you doing that.
A ranger is NOT just "good with a bow" class. I don't WANT to have to re-write 30+ levels of paladin powers because I want to be able to wear plate. (And explain how my Imposing Presence HEALS WOUNDS WITH A TOUCH? Wait, don't. Refluffers could justify making Orcus LG if they need to). It'd have been a lot simpler to have rogues use shortbows (as they did for 3+ other editions) than to have to rewrite another class to become a rogue (and sacrifice roguish powers like tumble for rangerish ones like Owl's Wisdom) with a bow.
I know lol, just imagine a martial battlefield commander who could heal allies purely with charisma and morale.
OH WAIT A MINUTE.
What's wrong with the idea of a Paladin being part of a Barbarian tribe? Do barbarian tries not have driven champions of causes? Or do the gods just hate them? The biggest problem I see with it is justifying why the Barbarians have plate armour.
Oh, that one is easy - Dragonplate. Ankheg Shell. Bulette Carapace. There's a long fantasy tradition of animal materials that are amazing enough to count as plate when compared to metal armour, which also by the by makes for some really cool visual character design.
Alternatively, if you want to focus on the divinity angle, you could have some kind of tribal ritual that imbues mundane hides or leathers with divine will of a wilderness deity/primal animal spirit/your ancestors/etc. Bonus, both suggest interesting roleplay/setting hooks, like describing how the ritual is performed, or having a whole tribe dedicated to hunting really scary shelled/scaled things for making said armour.
Interpretations of the paladin code in AD&D was a pretty common topic of discussion in the "Letters" and "Forum" sections of Dragon magazine. It may have worked well in your groups, and I never experienced any significant issues firsthand, but paladins seems to have worked poorly for many other groups due to differences of interpretation in how they should be played. From a modern perspective, with RPG design having been refined over the past 40 years, I think that it's a poor design in general. The AD&D ranger, druid, cavalier, and barbarian classes are marred by a similar design philosophy (to varying degrees).
Concur. Since BRG is using anecdotes, I might as well mention that I have
never, in any group I played with in the last 15-odd years, seen a paladin played without a fight breaking out, with the sole exception of one who in all fairness was permitted to act as more "friend to all creatures" than "zealous evil-destroyer" (I mean he was a righteous crusader for sure, but there was zero chance he would have killed the Orc Babies or sided with the Corrupt Authority - it simply wasn't a question in his mind). In other words, the only time I saw a paladin
not be the source of unenjoyable conflict was when he was houseruled such that the code was relaxed.