. +DEX : helps you run around faster and gather a train without dying.

. +STR : helps you do more damage, this is essential in healing yourself with VR.

. +CON : might have been good in C4, but in C5 changed the "revival" skill so that it can only be used with 5% hp. thus, its not really a skill you should be depending on.

Gladiator
Like the warlord, you are a great PvE class, although unlike the warlord you fare a bit better in the arena. If you go +STR go all the way with +5, same with dex if you go that way. tallum heavy and kesh*kesh go great with +DEX, magestic heavy and kesh*dama goes great with +STR. most people seem to max out one and also do a bit of the other Lineage 2 Adena.

. +STR : increases damage, never a bad thing.

. +DEX : helps you catch enemies in PvP, and helps attack speed.

Paladin
As a tank with majesty threes really not any point in trying to evade hits with a +DEX setup. you want to get your  Lineage 2 Adena. def and m.def as high as possible through over-enchanting gear, so that you need less heals when tanking for a party. nightmare heavy or majestic heavy should work fine.

. +STR : increasing damage is nice for PvP and PvE.

. +CON : tons of extra hp is nice for PvP and raids, but get a health SA as well.

. +INT : I'm not sure if increasing INT affects the "sacrifice" skill in C5.

Dark Avenger
As a tank with majesty threes really not any point in trying to evade hits with a +DEX setup. you want to get your p. def and m.def as high as possible through over-enchanting gear, so that you Lineage 2 Adena need less heals when tanking for a party. most DAs wear nightmare heavy because the shield bonus stacks with the "reflect damage" skill.

. +STR : +STR : increasing damage is great for PvP and PvE.

. +CON : tons of extra hp is nice for PvP and raids, but get a health SA as well.

. +INT : great for soloing, with drain life this setup lets you go forever.

Treasure Hunter
Dark crystal light looks like it would be a good armor set, or nightmare light if going Lineage 2 Adena against magic wielding mobs/players. get a dagger with focus or critical damage.