"luck ratio is not well thought out, and not even necessary in my opinion. it is implying that all cards of a certain rarity are of an equal power level, which is obviously not true."
True, but it's the ideal which I imagine the developers are working towards. And in any case, you'd have a hard time arguing that, in general, rares aren't much more powerful than uncommons which are much more powerful than commons.
"it doesn't take into account getting extra rares off of cards like bestiary, ranger, all fo the "school" cards, the dragon keyword, and about a million other things. third"
This makes sense though. When you get a rare using a card like Scepter of Summoning, it's not a matter of "luck", so it shouldn't affect a measure of your luckiness for that game. You're paying for the rare, not getting it by chance.
I don't think the luck ratio thing is a bad idea, but I wouldn't be too heartbroken if it wasn't included in the player rating system.