I think the problem is one of archetypes. Paladins have a pretty strong archetype - Knight of the Round Table, Age of Chivary and all that jazz. You get a very specific image of what a paladin is, just from that. So, the strictures make sense - after all, the Knights of the Round Table had the same sort of strictures, so why wouldn't the class based on that archetype not also have them?
Clerics, OTOH, never really had a good solid archetype. What, exactly, is a cleric? Is he a preacher? Is he a holy warrior? What? And, no strong archetypes really jump out for the class. ((Yes, I am aware of the Crusades underpinnings of the class, but, they aren't really all that strong - after all, since when were Knights limited to maces?)) So, because no one has a really strong image for what a cleric actually is, no one really worries too much about how the cleric acts. So, when your LG priest does something that's a bit dodgy, he gets the pass, because, well, it's not too bad, it's justifiable, and he doesn't have a code of conduct hard wired into his archetype.
Excellent observations.
I think it's the inconsistency that I have the biggest problem with. If clerics are as restricted as paladins, or if paladins are only as restricted as clerics, there isn't this asymmetrical archetyping. But having one class be be a one-size-fits-all chasis, and another class being a xerox copy of a few very specific figures just gets under my skin.
If you're referring to magic-users (mages/wizards, I mean) as the reality warping guys...then I would say a d4 Hit Points, no armor and hardly any useful weapon are quite the restrictions. Whether they offset to/balance against the extent of a paladinic code is up to debate, I suppose.
RP restrictions don't balance mechanical restrictions, IMO.
A Paladin is chosen by his god, with the specific duty of being that god's exemplar of physical might. He is the living embodiment of the divine's vengeful side. He or she may not even be willing to serve in that capacity (see Jeanne D'Arc).
To my way of thinking, a paladin isn't chosen any more than a cleric is. Arguably, this conflicts with D&D literature but honestly...I've never been all that concerned with D&D literature.
There was some mention that literature (old non-DnD literature) supports paladins losing their powers for not following their code. Where is that from?
My own experience with literature actually written back then is pretty limited. Mort d'Arthur and that's that. No special powers for most characters (Lancelot was super-human, but none of his powers "map" onto the paladin class) and even jerks like Mordred and Agravaine could be knights of the Round Table.
I have a degree in English, and I took a whole course on Arthurian legend, which focused mainly on Le Mort D'Arthur.
To be blunt,
all of the knights were a-holes. Arthur and Lancelot included. They didn't care about protecting the innocent or the weak; they didn't care about justice or fair treatment. They liked Arthur because he led them in bloody victory and in loot, and they generally respected other Knights of the Round Table and noble [read: sexy and wealthy] ladies.
But our idea of chivalry and honor is grossly distorted from how it actually worked. Arthur's knights, Lancelot included, regularly attacked and killed peasants and outsider knights just for being in the way. Their creedo was basically 'Might makes right, so long as we thank God afterward.'
One particular story starts when Guinevere is kidnapped and taken to an enemy castle. In order to get in and rescue her, Lancelot decides to commandeer a horse-and-cart to hide in. When the owner of the cart objects to having his cart stolen, Lancelot simply kills the peasant with a slap of his mailed glove. (Apparently Lance was
that strong.) And that's how Lancelot got the name 'Knight of the Cart.'
Arthur himself is far from noble, as we imagine him. You know how in the bible, the Pharoah tries to kill Moses before he grows up by having all male children murdered? Well, Arthur does just that when he hears the prophesy that his son will one day kill him. He has all of Britain's recent male babes drowned; obviously Modred escapes, much as Moses did.
Arthur and his knights rule Britain for many years, so by the end of the saga, they lose some of their vigor. But I don't remember any divine weakening that wasn't a direct result of exposure to the Grail, so I'm skeptical of the idea that Lance's indiscretions have anything to do with his fighting prowess.