Nope, disagree. Morphling is mana efficient, but not a bear. Spiritmonger is Mana efficient (Is it ever!) but not a bear. A bear is a card that costs 2 and has 2/2 for power/toughness. The rest of the features are debatable. They were named so because there are, according to one dude I once read, 3 creatures. hill giants, gray ogres, and Bears.
Besides, the original bears didn't have a drawback, were moderately splashable, and had no special defensive ability. They were vanilla, but it's successors weren't.