I have several issues with LG paladins. One is that your deity is your same or similar alignment as you, if you are a cleric. So why be lawful if you are a paragon of your deity's whims?
If your god is LE or CN, and you are an avatar of that god, you should be a champion of their ethos. So if they design Paladin with Oath of Justice to be defined as the classic LG paladin, that should be explicitly restricted to LG or LE or LN gods. But they aren't. So they're trying to achieve independence of the alignment system having any repercussions, while also trying to force a strong alignment ethos by skirting it entirely.
It is beyond stupid. If you're LG, the be an LG paladin of an LG god. If there is such a thing as a NG, CG, or LE or CE "paladin", those should be defined by appropriate subclasses where there are actual rewards for behaving in such a way.