Rog is a fairly controversial character because he is described as slaying several Balrogs, whereas much stronger warriors like Ecthelion and Glorfindel fought one, and still died while killing them. Unless there are different "grades" of Balrogs, with different levels of strength, I don't think that Rog could have slain many Balrogs. Most likely, he would have been able to slay the "weaker" ones.
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But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.
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