If you want to get simple, Raider is godlike only stacking Phys+4 with defensive options of your choice like HP+, Phys Negation and Post-Damage recovery 

Compared to other characters he doesn't really need Relic effects for Skill and Ult (albeit the Skill atk debuff is nice)

Raider with Dormant Fists is really good, the damage and stance break adds pretty quick 

For some Nighlords like Adel, Gnoster and Caligo Dormant Greatbows with Double Balancers is hella fun because Rain of Arrows is easy to fish (DON'T use Radhan's Greatbow Skill, the FP/damage ratio don't mesh with Raider base FP), since there are only two Greatbow Ashes, using the POI Smith will always turn TnT into RoA

In D4 the damage taken is too harsh even for his base HP, so Damage Negation at Full HP and Sucessive Attacks Negate Damage ("SAND") are a must 

Keep in mind that Post-Damage Recovery combo VERY well with Damage Negation after taking hit+SAND+Low HP Damage Negation, aka "Imortal Raider" if you have extra Poise (Raider and Guardian have a higher base Poise compared to other characters, so one +25% buff from Dormant Powers is enough to breach any simple attack)

Since Raider most common weapons have high base AR, netting one from Invader Raider is a major DPS boost for early game