Taking a poll. Vote Yea or Nay
My overall stance is that it is not a good idea. Although there are exceptions to every rule, it is almost impossible for a parent to be unbiased in their treatment or assessment of their own child. Either too critical or alternatively view the performance through rose colored glasses. Even if somehow you're able to remain objective, the optics are bad and leave yourself and team open to criticism.
Youth - Yea - in most cases dads are needed at this level as you don't get a ton of people volunteering to coach 3-6th graders.
MS - Nay- not a good idea if you have alternatives
HS - Nay - not a good idea if you have alternatives
There are a bunch of variables:
1. Qualification of the coach - better be rock solid.
2. Player's talent - As the player's talent level goes down, the number of questions goes up.
3. team performance - If you go 10-0 there will be questions but they won't be very loud. If you go 1-9 look out.