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Unicorns are effective against warlocks; by the way, they are very strong.
Dancers die quickly, so it's better to use other units to retaliate – it's similar to the berserkers of the dwarves. Fairies do die quickly, and there's almost nothing you can do about it, but someone has to sacrifice themselves!
By the way, when there are many druids, they shoot stronger than they cast lightning...
As for attacking dragons, they can't survive alone. In general, no unit is too strong on its own, so rushing with fast units isn't always a good idea.
P.S. – what kind of army is it if a single meteor shower destroys 2/3 of it? In the expansion pack, this is a very weak spell, so there shouldn't be more than