The thread isn't a discussion on what the game mechanics are, but rather what they should be. Having said that, it seems as though the most controversial of the poll is obviously the concept of immaterial creatures. Scaredgirl covered the basics of what immaterial status on a creature means, and I will elaborate only to extend the definition of the mechanic to include that no immaterial creature can be buffed, debuffed, or in any way removed from play once it has entered play. Immaterial = immortal.
I don't see anything wrong with the immaterial mechanic, as it just provides another wrinkle to the game that makes it interesting and fun to play. In the future, who knows... maybe it would be kind of fun to include Wrath of God effects as a counter-measure to immaterial creature spam decks, if they exist.