Is it still worth mining bitcoin right now ?
Its the same old story, for most people mining at home on a moderate / expensive electricity tariff its not profitable even with efficient hardware. If you have cheap electricity and efficient hardware than you maybe returning a small profit but I don't see that continuing for much longer.
Its winter here and if my miners weren't providing supplementary heating to parts of my house I'd switch them off and sell them. They are costing more to run than they're mining and that's been the same for the past few months. I don't mind at the moment though because of the heat they produce. Come the spring they're gone though it pains me to say, however electricity here in the UK is right up there with the dearest in the world.