The thing is, if you are really posting to demonstrate some aspect or another of your arranger's operation, well, primarily you need to at least have the skills to play a song correctly (few timing glitches, relatively correct melody and chords unless deliberate substitutions), before whatever aspect of the arranger you are trying to show off doesn't get hidden behind an appalling performance that masks your point completely.

The other part of this thing we are seeing is that, the more one posts about one's own competence, steadiness of pro work, and sets oneself up to be the 'king' or 'expert', the more fair it is that one's work can be critiqued at that level.

If you can dish out criticism, you should be able to take it...