Also genius, Sam and Dean can only kill angels and demons through specific weapons like the Demon-killing Knife, the Colt and an Angel Blade, or specific spells and items like Holy Fire. They NEVER defeat even regular demons in hand-to-hand combat.
Hell, the first demon which ever appeared in the series, and who isn't impressive nor notable in the slightest, ripped an airplane door open.
And by the way:
"even Drakness almost got Defeated by some witch or Demon"]
Ignoring the lack of grammer, no she didn't. The Darkness got attacked by the combined force of a coven of witches doing a spell which they did lot of prep for. She deliberatedly allowed herself to be hit, the spell did **** all to her and the witches all died. Then she got hit by the combined power of demonkind, and even after that by the entire Host of Heaven. She was left rather hurt, indeed, but most of her damage was exclusively on her host.
Oh, and after all that she was stabbed by Lucifer's Lance, and she was still capable of overpowering God. The same God who created the Universe, Heaven, Purgatory, Hell, and many other universes billions of years ago, all of which were destroyed by The Darkness much like she could destroy God's curretn universe.