From a sound engineers perspective, All quality mics, usually $99 and up are all good at what they are designed to do. The reason why some mics seem to perform better than others are outside factors

- everyone's voice has a different sound quality, eq, volume
- each pa that is being used has different levels of sound
- each room you play in will affect the sound of the pa, and the sound of the mic
- the volume you sing at or the volume that is around you will also affect the mic sound
- even if you have a great mixer, but don't know how to adjust the gain on your channel or the basics of hi-passing can make a $1000 mic sound like singing into a bucket

Also just for fun, Mariah Carey usually sings into a very super expensive condesor mic, and lately hasn't been sounding that great, Do you blame the mic? Also I just saw Paul McCartney and Billy Joel, and they sounded amazing, and they where both singing into a sm58 and Bet58 shure, which start at $99

more expensvie mics are always a better route, but doesn't always fix the other issues.

It's funny, I play equally bad on a cheap keyboard as I do on a $5000 keyboard