I play all of them and I can only recommend doing the same. My players love them. Anger and Brawn slot perfectly into the gruul madness strategy I support as my guild archetype, and Wonder is nice there as well as in Ninjutsu or Dredge decks. In general you can say these are sweet with all kinds of "putting a card into my yard", wether it's discard, selfmill or sacrifice.
The effects of Anger and Wonder are easily worth a card already, and in the right decks, Brawn's can also outright win the game. Not to mention that they are solid if hardcast, as your opponent usually doesn't want them to die.
If I had to rank them in a vacuum however, I'd go with:
Wonder > Anger > Brawn
I wish the black and white one wouldn't suck. Lifelink and deathtouch could be spicy abilities to grant. Or considering the time they came out, I'd also take fear and vigilance.