Kagome is your typical 'girl stereotype', she is weak, psychically unfit, needy, and reliant on others (men) to save her. The only time she is useful, is when she's put against a 'love rival', or when her 'man' is in danger. With no training, she is suddenly all powerful -.-
She makes the story go round, and she saved Inuyasha’s life a couple of times. Kagome first came into the story with the sacred jewel, and shattered it. The story starts there! Without Kagome, the anime Inuyasha will not be here. Those are the main reasons why Kagome is not useless.