O.O if you say so. . . just because that's the common criticism doesnt mean people didnt enjoy your rapping0. And if people are saying it's the qualities fault then clearly they are a fan of what you skill... btw as someone whose taken sound recording classes I should mention, you could record the audio with the on camera mic pointed towards your mouth, 4 inches (10cm) turned slightly away from you to avoid the need of pop filters. You can bring it into a video editor and just delete the video track and render it as a wav file and then bring it in to your favorite audio editor) It's will come out very clear. Not saying that it's pro gear and clearly it depends on camera but for a long time that was how pro recording were done because Video Cameras we able to record longer then audio cassettes. And I know that really "old school" but just as the audio world has improved so has the quality in the microphone in a video camera. I don't think dishing out 100-200 dollars is what's going to make people think your serious.
What I really struggle with is cleaning up vocals perfectly. I've never taken lessons in doing so and just taught myself how to do it so it's not a perfect art unfortunately...
What are you more comfortable with?
