Speaking of free stats...
40 armor and magic resist, heals 10% of his max HP at level 16 as well as having in-built 1% max HP true damage on all attacks and 25% armor reduction at level 1
40+ AD at level 1, heals 1.5% of his max HP at all stages of the game, in-built 30% tenacity
Free armor & magic resist per level, extra movement speed and attack speed per level
14% lifesteal at level 1 - 24% at level 13, 5 seconds of attack speed and movement speed slow, 35% armor reduction w/ free magic damage over time and waveclear, 15 to 55 free armor and magic resist scaling up in increments of 1 to 3 bonus per second over the 12 seconds of his ultimate coupled with free health on demand.
40 to 80% attack speed at level 1 + a potential 0 to 99% additional attack speed based on missing health, in-built 100 to 300 true damage that does not cost mana and refunds health similar to Mundo's Cleavers, 10 to 30 bonus armor & magic resist in-built
Slow, stun and cooldown resets that also grant him movement speed, 2% of his maximum mana per second and 43 to 160% bonus attack speed, coupled with hybrid AOE damage that scales with total AD and has its cooldown refunded on basic attack
heals 2 to 6% of the max hp of any enemies dying within a huge radius around him regardless of him killing them or not, gains 20 to 40 bonus attack damage on an auto attack reset that also drains 10 to 20 attack damage from what he attacks, along with 20 to 80% free attack speed and 20 to 40% free movement speed as well as healing for 10 to 17.5% of his target's max HP as well as stealing 40% of their total armor and magic resistance
AOE 2 to 8% max HP basic attack in all directions capable of applying on-hit effects as well as a shield that also doubles as an offensive tool auto-firing on nearby enemies at 3.0 attack speed and allowing him to walk through minions
5-15 bonus movement speed and 10-30% bonus attack speed at all stages of the game, potentially increases to 40-100% free attack speed with in-built 2.5-5% missing HP healing on basic attack, 20-50% in built movement speed that also stuns for 1 second on basic attacks and an in-built sunfire cape dealing 40 to 200 magic damage in an AOE around him as well as another 40 to 200 magic damage in a titanic hydra-esque cone ahead of his basic attacks
deals 2.5 (+4.5% total ad) true damage IN ADDITION to regular basic attack damage healing 30 to 115 health on every proc and gaining 20 to 50% movement speed for 1.75 seconds, along with a 16 to 4 sec cooldown dash that applies on-hit effects, procs true damage, counts as a basic attack reset, deals bonus damage, complete invulnerability for 1.75 seconds that also deals 90 to 250 magic damage, slows enemy movement speed and attack speed by 50% for 1.5 seconds that can potentially stun for that same duration along with in-built 50% bonus attack speed and 140 to 200% damage critical strikes that also counts as a second auto attack reset, as well as potentially activating the passive movement speed increase without actually proccing the true damage as well as allowing the true damage, healing and movement speed to be procced a second time four times in a row which will heal her and all nearby allies for 80 to 140 (+60% bonus ad) health every second for 2 to 5 seconds
in-built 3-9 / 9-27 (minions-monsters / champions-clones) (+4% bonus ad / +12% bonus AD) potentially increased to 9-27 / 27-81 health per unit hit by an AOE spell, 2-3 hit auto attack reset that stuns for 0.75-1.5 seconds on basic attack, with in-built 15-35% armor reduction and free on-demand 250-750 health that also provides a free sunfire cape effect for its duration
In-built 20% max HP shield on basic attack, dual basic attack resets that deals bonus damage as well as granting 20-40% bonus movement speed on each reset and converting a basic attack with all potential on hit effects to 40-100% true damage, deals 6-8% max hp (+3.3% per 100 AD) that also heals for that max hp damage along with a long range dash stunning for 0.75 seconds and granting 40 to 80% bonus attack speed, still in-built, coupled with 5-15 (+4-8% current hp bonus damage) on every basic attack
Darius is hardly the only champion with free in-built stats. If you're going to complain about one, complain about them all.