Yo! don't be a smart ass, you can't judge anything by just seeing preview, comment only if you have taken the course completely, I have heard good things about it from people who actually had taken the course.
Hmm. The only way to know something is good is to check the preview, if they're not putting effort in preview from where people decide to buy (There are like 15 preview videos, it's lot of sample size). Most people who've taken this course? Can you show me them? Every institute employs paid tatto in quora and reddit these days. It's tough to identify what's good or bad.
I used to be like you! I usually couldn't learn anything without videos or physical teachers. So, I joined an institute even though I wasn't satisfied in the first preview day. Yes, no surprises, it was my worst experience and worst money loss. Would not I be happy if you guys joined that course and downloaded and shared it here? Because I won't pay and still get to watch it! I'm saying for your best. Because I know that 10$ isn't less money for middle class people in India. Our family earns it very hard and generally only 1 person earns.
As I said that mlminds course is the only DECENT course in data science. Most in udemy aren't great either because this is very new technology. After 2-3 years, there will be great big data courses online.
Plus the most important part of any online courses is solving your doubts! You can get it only if you pay single handedly for it and only the person who buys that course from his account will get that facility! So, I'm not sure you're going to be benefited heavily. I'll share if I see any courses in the future here.