There are several things wrong with this request in my opinion;
1. The game in it's current state is riddled with game crashes. This often means people "quit" without actually wanting to, and there's no way to reconnect.
2. People aren't matched into this system based on skill, or experience. There is no ranking, no benefit to actually winning currently... therefore a player who chooses to quit your team should not be penalised.
3. A person's skill level shouldn't determine your commitment to playing the game. Either play with premade squad first, or teach the new players as they come into the game. Tell them to stick with you, advise them what weapons you feel are best for your playstyle. Teach them when and how to use their abilities (if you know their hero).
Basically, quit whining and asking for Report Functions before this game turns into the abomination that is Overwatch and it's toxic, whiny, report crazy community.
@BoaFang7 - finally someone else that understands how badly that report system has affected its community.