Right here is my problem.

I'd like to start an Army, namely High Elves, but my mates are saying they wont play me because they think they're broken as all hell.

Now obviously I'd like to play the army of my choice but i also don't want to play a broken army.

Are they right? If not what can i say to convince them they're wrong?

Especially vehement about it is a Dark Elf player. He says my elite troops are way better than his. i dont have enough knowledge about it to argue back really.