Are these poor quality ESCs OK?

[Ishitbh (Ishit)]

read this:

Hardware To Avoid When Building Your First Multirotor

Hobbyists new to Arducopter, or Ardupilot in general, often make the mistake of starting out with sub-par hardware which in the best case causes frustration and in the worst case actually costs them more in the long run when expectations are not met and the hardware has to be replaced. So, the following is a suggested list of hardware to avoid. I realize cost is often a driving factor or limitation but this is not considering that, simply performance. Flight Controllers: The APM flight control…

They are NOT AT ALL GOOD.
Please replace them with something better.

Even my first multirotor used them. after replacing ESCs, my copter started flying.