I'm a commander of my clan and I can tell that Its very stressful sometimes when I'm playing in public servers. But Before I was in a clan I used to play on pubs very much so people started to know me. Now almost all people from my country knows what kinda a comm I am. People trusts me and most of them do follow my commands very nicely.
Its very nice to comm in publics because I wont know what the alien team will do and sometimes I dont know what the heck my team is doing but I have used to it, these things makes many other commanders angy but I take this as a challenge. Still Usually my team wins and when we win I'm quite a happy

not because we won, its because I made my team to do its job and working as a team. Thats the best lesson from publics. I need to think about many different tactics when playing in pubs because I cant know what will happen next. There has to be always plan B.
I'm not the best and I think its very hard to get even close to best but I still try and publics are great practise if u want to advantage yourself to next level (better than clan matches).
But I have to say that when playing in foreign servers, people dont know me at all. I have been ejected few times in foreign servers which make me feel angry. But insted of barking to all of the players I just leave the server. And I leave because I'm very whiny person and usually my selfconfidence has gone after this. Usually the main reasons why I get ejected is that I dont build turret farm in base and I dont elec RT:s. That makes people whining at me. Its very stressful indeed that they are complaining about that all the time and all things they do is just typing whine text ( All the game time just whining, they dont have even time to move when they are so busy whining ) and sometimes they even say: " I wont move until u do as I say ". Not good teamwork ehh... This is the main reason why I'm not so well known, I dont wanna play in foreing servers. ( Hehe, I have ever even heard of those best comms that u guys mentioned )
And I partly agree with u, This is only a game. But I dont want to play this game if there's some persons who takes this too seriously. They usually use that sentence when they are only soloing all over the map and I try to make them to build RT:s. They just say, Relax this is just a game. Its not very nice. If my team do all that it can do then I dont complain, then I think: This is just a game. Every day I lose some games and I just have to accept that. And I do accept that if my team had followed my orders and try to do its best. But if there are any players who just do whatever they want, eg. If someone of these solo guys gets himself to hive and theres no aliens, I place PG there but then this solo guy just say I dont wanna build it, and then he starts to knife the hive ... I cant stand these guys :/ .
Its good not to take this game too serious but there are players who really want to play as well as they can and then only 1 guy can ruin this.
(And if someone wonders who the heck is this guy (me), where he comes from? My answer is: Im proud member of uRd and I come from Finland! ( Suomi Finland Perkele !)
PS: I'm not so good in English so forgive me if I made some mistypes or grammar mistakes