As you could probably guess when I wrote my version of the Barbarian class, I do not really approve of classes written in the style of "these are exactly like this other class, except that they have more hit points, and they're better, and they also have a bunch of abilities from other classes, plus a bunch of other other abilities, and they are the best at everthing forever and ever and I love them, so there."
The other major offender from Unearthed Arcana was the Cavalier. Time to give them the same fix.
CavalierConcept: The arrogant, high-class mounted warrior, like the knights of chivalry.
Alignment: Any, but Law and Neutral predominate; they prefer a srrong social order that supports class distinctions (as long as they benefit,) and some expand that to include a strong cosmic order as well. Still, the occasional Rogue Knight aligned with Chaos will attempt to enforce obedience and subservience to themselves, without any regard for a social order at all.
XP/HD: As Fighter, but prime ability is Charisma. Invert the experience bonus for Charisma: they have an XP penalty for high Charisma, a bonus for low Charisma.
Weaponry and Armor: As Fighter. All standard Fighter abilities apply, too.
Limitations: Cavaliers suffer from a crippling sense of custom and tradition; when confronted with a situation that violates their sense of the way things ought to be, they are horrified and even frightened. If confronted by a lower class opponent pretending to be a knight or noble, or if forced to do something they consider shameful or beneath their station, NPC cavaliers make a moral check at -2, and PC cavaliers must save vs. fear at -2 or be effectively ovrburdened for the remainder of the combat (Move 3, always go last in combat.) What exactly counts as lower class or shameful depends on the culture, but the GM should include at least two arbitrary conditions, such as "being/dressing like a woman" or "using long-range weapons". Players should pick one personal point of honor that counts as well, such as "being unhorsed". Note that these "points of honor" are not necessarily enforced or even shared by those who aren't Cavaliers; in fact, it's better if commoners think of the cavalier code as weirdly old-fashioned.
Cavaliers get a -1 reaction from peasants.
Other Abilities: Aside from their code of honor, Cavaliers never check morale or save vs. fear from mundane threats. They also never fall from a horse by accident, only if cursed, affected by a spell, or deliberately unhorsed. A warhorse trained by a Cavalier for at least a year will have unusually high intelligence and will act like an illiterate, mute henchman instead of a mere animal.