Sounds like you may have been a little unlucky with its build quality.
Or perhaps you need to have another run at installing it.

I have seen others post that their H50 surpassed their megahalem.
This whilst noise levels were not notably higher than their megahalem.

Granted, megahalem is no longer the air cooling king.
I can't recall where I read this now, I'll try to find it....