Seems to me that Beast Boy is the most underrated Titan, aside from Robin in terms of power. Robin of course has no powers at all. But Beast Boy's shapeshifting makes him a formidable opponent. It seems to me that if he were to explore his powers more and learn to harness his animal instincts he would be an incredibly dangerous opponent, as he has access to the most potent venoms in the world, and some of the strongest muscles as well. If he were to be a bit more imaginative, he could fight alone. But he seems to lack the understanding of just how powerful he could become. The Werebeast is proof of his potential power.