There's good uns and there's bad uns but don't forget that one of the most important and most overlooked parts of the system is 'microphone technique'. Back in the old days a singer would learn to use the microphone. Nowadays the only technique a lot of singers know is, 'get too close and shout'. Then they wonder why no one can understand the lyrics.

If you know what you're doing then, a cheap microphone can sound quite good, but if you don't, then the even most expensive microphone won't help you.

Bert.