it's funny I was recently suspended for similar reports.. granted I did tell someone they had downs in one game.. but still.. the other games were completely unjustified. I wonder if RIOT realizes that the trolls can also go into the system and vote.. hey lets all just vote +punish for a month and see what happens? Maybe they will do something like take out chat and put in auto chat commands like pressing a button calls MIA, RE, GG WP, etc.. and make it have a spam filter just like the pinging. Most of the time I don't type when I play ranked anyway, so why not just take chat out of the game and implement commands + pings.. that's all you need.
Then you won't even need this report system !!! you will just have the intentional feeder report !