It is all about the potential to do those big turns where you do multiple powerful things
A useful Rule 0 explanation can be as simple as: "My deck is an upgraded precon, has no fast mana, and can win with a three-card combo after turn seven." This would tell the table far more than simply saying, "It's about a seven out of 10." Rule 0 can also be used to modify parts of the format
They also have the interesting tension of being potentially snowbally and good while your ahead, but also giving your opponent more time and life to work with and come back because you're specifically not attacking them
If the search is simply for a number of cards without stating a quality, you must have them find that many cards (or as many as possible, if their library doesn't contain that many cards)
Its definitely not a case of one deck simply beating the other
Because they (unsurprisingly) have attacks that deal 300 damage, some have noted that their unplayability prevents their price from shooting through the roof on the secondary market