Read this former member's account: https://www.quora.com/Is-ISKCON-a-cult Arranged marriages, emotional torture, required clothing, thought control... Oh yeah, it's a cult. Not like Scientology where they're after money, but it's still destructive.
Hare Krishna worship the Hindu god Krishna and the definition of cult is a system of religious veneration and devotion directed toward a particular figure or object.
They are a religious moment based on Vaishnavism. Hare Krishna's belong to Gaudiya Vaishnav sect. I won't call them a cult unless we start labelling Roman Catholics and Protestants sects of Christianity also as cults.
No. It's a evangelical branch of Hinduism. Nothing more.