razer carcharias headset mic barely works

[Dazz]

Best way to test is to just get another microphone and try that out, and if you can, try another computer with the Razer headset.
Swap out the things that might be wrong, and determine the cause.

If another mic works, then it's your headset. If the headset then works in another computer, it's you computer being configured oddly with that headset or something...