I'm a fan (and you should be too) because...
Adam is completely and utterly unique. He completely blows through every stereotype, status quo, and standard that people have set for people. He's fun and original with a voice that's out of this world, and yet he retains a completely grounded view of the world without a hit of ego, even though he has every right to be full of himself. He has no fear of what the public thinks of him, about his sexuality, his image, his voice, etc. He is completely and steadfastly true to himself and others. THAT is why I'm a Lambert fan.
...that, and he's f***ing sexy!!!