Let me preface this by saying I don't actually care, even if it comes across as that, I'm just making a point:
When you go to war, does it really matter to you if the war is interesting, or do you just want to win?
If someone comes up to your family and threatens them with a gun, do you say "I hope this is interesting," or do you hope the offender is defeated?
Lots of times when people play ranked, the point is to get to their skill level's elo, and then to gain skill and increase their rank. Most players want to be as close to #1 as they can be, regardless of if they just used the 1 easiest-to-play-hyper-carry champion.
If the game is interesting, awesome! Something worth to remember. But who wins a game and goes "Meh, not interesting enough."
It is nice to see people having fun with the game, but if someone argues with the rest of the team because they're in it to win, not 'have fun,' they're making a very valid point. Yes, it's just a game, but to some people any bout of competition is more than 'just a game.' And those people aren't any lesser than you just because you take it less seriously.