I'm pretty sure the report system has changed some player's behaviour, but I'm not so sure its the way Valve thinks, I just want to give you an example of a game I played today.
Type of game SD
I get doom, ursa and storm spirit
I say "I'll probably doom or ursa for jungle depending on their picks, so an offlane hero might be a good pick" (they pick a lot of casters and I go doom)
A noob that instapicked ogre magi says "This is gonna sound dumb but what is offlane?"
I and other guy explain him "Its the not so safe lane, depending if you are dire or sentinel its up or down, the safe lane you can usually pull creep and you send the carry, so a good offlaner is a hero that can hold his ground 2v1"
Then in his lane he keeps autoattacking and wasting skills on creeps.
Drow asks him "Please stop autoatacking"
I start explaining him (Not insulting, as calm as when I explained him about offlane) "You are not supposed to autoattack because you want to keep creeps close to your tower where its safer, and you are not supposed to last hit either because you should be supporting drow,
And then he goes all nuts "Fuck you, Ill attack whoever I want, Muted and reported"
Now....Is this single game: a definite true of how broken and misused the system is? No! of course know. But I think most of you have seen enough of this and other similar things to realize that the system is not working as it should.
And I do know the system could be improved heaps, to actually target the real grievers.
So anyways, to clarify:
This is not a suggestion about how to fix the report system (I have made very detailed posts about that if you wanna take a look at suggestions) because apparently valve thinks the system is awesome, and hence there's no need to even consider changing it.
This is not to say "Meh, whatever, move on"
I would appreciate, welcome and will gladly discuss with both sides. My point being:
I'm SURE the report system is broken.
But I'm willing to hear opinions about people who think its not. (Saying "Forget about it and play on" is not an argument, and if it was, it would just be supporting my assumption)
Or if you do think its broken, simply say why.