Microphone quality is really poor in my Macbook pro 2018 (15 inch) when I compare it to Macbook pro 2016.
When I enter Audio MIDI Setup on Macbook pro 2018 I see (sorry for polish lamguage):
However in Macbook pro 2016 it was:
Is it OK for my Macbook pro 2018 (15 inch) to have only 1-in ?
1 in / 0 outs
doesn't necessarily indicate a hardware problem, but we do need more information about your setup. Can you edit your question to include a screenshot of the Audio Devices window within Audio Midi Setup? Make sure the Microphone option is highlighted in the left sidebar when you take the screenshot. This will help us clarify your configuration and if you have any other devices and/or software that's interacting with your audio inputs/outputs.