Right. I'm not the best player but when im on im on. I just went 28/5 with akali on my smurf...granted....smurf and akali.....but still. I'm so serious about the game (at least i was before my ban) and need to always do well because that's just how I like to play. Now I can promise you I wont be buying anymore RP, my 18 skins are staying at 18.
However rito would probably defend its system by stating that you shouldn't call other players bad...
but in a case like that....I disagree...because if a player goes 0/15/4 lets say...they obviously haven't had much of a hand in team fights (assists) and considering they didn't even have 1 kill but 15 engages (if they're support and don't have any kills, you cant blame them at all however, to be a support and have 15 deaths but only 4 assists, is still bad)....yeah...that's bad. and they should own up to the fact that maybe they're not a bad player in general, but that game they didn't do so hot.
They should acknowledge the fact that you CARRIED their ass ON YOUR BACK like a damn pack mule for 45 minutes. They should be grateful that you basically spoon fed them a win because they didn't do well enough that game to earn the win themselves. but instead they get butt hurt because you pointed out the obvious.
To avoid that alltogether, just don't call players bad necessarily. You can talk about how they had a bad engage or about something that they did that may not've been the best idea...but don't flat out call them a bad player...because that's just gonna piss some noobs off.. you shouldn't have to walk on egg shells when you play a game but...riot is rediculous.
If you wanna read something that I found helpful, I posted a post in miscellaneous titles What are and are not report worthy behaviors...the guy (i think) replyed to it with some pretty interesting and understandable instances. the league community is horrible and until riot fixes their system, im afraid we're all going to have to try to find a way to avoid getting involved with people who report unnecessarily.