chogath pass gain both hp an mana when kills, sure swain gains a little more mana than him but not enough for the cost of 1/2 of 1 of his spells, it would be fine if his spells were aoe, he even gains less then malzathars e an that can be gotten multiple times on 1 go.

Xou can NEVER compare 2 passives of a champ, that is jsut not viable, a champ is balanced around his WHOLE KIT, not around single abilities.

i believe the current oppinion on that matter is that swain and veigar should just swap passives

swain's passive is fantastic, free mana for completing a core mechanic of the game? uh yes please. also don't try to compare different champion skills like that it doesn't work.

i agree with fluffy1. yaun an marcus what are u talking about dont campare champ abilities, that is our main way of determining if an ability is to good or not.

no its not. when your looking at a skill in a champion's kit you don't look to other champions skills sets and go "well this is weak/stronger than so and so's skill that looks similar lets buff/nerf it" no just no. champions are balanced around their kit as a whole not someone else's, what sense does that make? it would become a never ending cycling of trying to make everyone's skills on par which each other instead of making that one champion balanced as a whole.

Umm sorry but if anyone needs a new passive its Sion, his is absolutely worthless and dont tell me that its great because its not. When AD champs get up to 300+ AD well that 40% chance to reduce an attack by 50, ya... At least yours is remotely thought out. Seriously I don't even notice Sion's passive even working.

don't say things like this when the math proves you wrong.

setting aside crit and armor for simplicity's sake, sion's passive is providing an average of 6% damage mitigation against someone with 300 AD.
against other bruisers and AS champs, it's substantially more effective.
if it applies after armor it's even more effective (anyone care to experiment on that?)

sion's problem is that he has no mobility, no poke, minimal lane presence, and unimpressive jungling ability.

as for swain. no, you can't compare his passive directly to cho'gath.
first, you should notice that swain's passive provides several times as much mana. particularly in the early game, where maintaining a mana pool is most difficult.

second, swain has a short cd ability that heals him. granted that's at level 6, but the fact remains that he can convert mana to health at almost any time. cho has his ult, but that's very ineffective on a per-unit-time basis.
taken as a whole, they're substantially closer, and I think the rest can be chalked up to them being different champions in other ways.