This Enchantment costs 4 and a Red mana to cast. Auras with a Converted Mana Cost of five need to be something special. They do exist, but is this one? To be honest, Burning Anger does give the Enchanted creature a decent effect: it gains the ability to deal damage equal to its power to target creature or player. The fact that it's creature or player is definitely important. Put on a 7-power creature card like Phytotitan, that's a pretty powerful card.
Unfortunately, this card is a bit mana-intensive to fit into the mana curve of most decks that would play Auras. It was useful in Limited, sure, if big creatures are already in the game-plan. It's going to be a fringe card even in the Aura-happy Commander environment, as it's in the wrong colors for the most popular Aura-friendly Commanders: Bruna, Light of Alabaster, Krond the Dawn-Clad, Zur the Enchanter, etc.) However, some other Commanders that make the use of auras, such as Uril the Miststalker, and even Kresh the Bloodbraided and Zurgo Helmsmasher, have made limited use of this five-mana Aura.
Burning Anger has a good design, and it's probably properly costed. But, it's just another bulk Core Set rare when all is said and done.