I'm a Queen fan as well and there is no comparison.
The Darkness are about the silliest band I've seen in a long time. They typify the British obsession with "the next big thing". They will be regarded by some critics as "post-ironic" but in the end will be laughed at as just being self-parodying. It's like Andrew WK a couple of years ago - he was hailed as being the saviour of rock and being very tongue in cheek with his testosto-rock, but in the end he simply silly.