HackerRank can be a very good way to screen developers before interviews. The author and most people in the comments nearly say, "Algorithms are useless. Writing efficient algorithms?! Who needs that?" :O

Some of the complaints are that HackerRank doesn't test things like team work. Of course, it doesn't! It's a good tool to screen developers. Things like team work, creativity and domain knowledge can only be tested in interviews.

I am not saying HackerRank has no issues but, discounting the importance of algorithmic problem-solving is very unwise, imo.