I know this is probably the 1000th thread about this...
—But leaver buster's "I agree" crap has to stop.
I just got out of a game where the client crashed before I could even load in (I was playing as ADC). I spent the first 8 minutes of the game trying to force the client to let me to reconnect, and once I finally did, there were already 9 kills on the board between both sides and everyone was lvl 6 or higher.
Number 1 thing that tics me off about getting a leaverbuster warning: It was strictly LoL having issues; everything else on my computer ran smooth like butter, but when I opened LoL, it went on the fritz.
Number 2 thing that tics me off about this experience: I have not had another issue like this since the middle of last June, and do not AFK unless the client crashes like this.
Number 3: I did not hurt my allies' game experience. They told me as much once I reconnected (they were up in kills and our Tryndamere "Support" had gotten to have solo lane gold and exp while I was loading in).
Number 4: We went on to Roflstomp the match, winning with a 12k gold lead (and I had the 4th highest gold in the game to boot), up 9 kills, and only losing our 3 outer turrets the whole match.
Number 5: Me and my team had 0 flaming, raging, or anger the whole match (even with the client botching the load in), which lead to it being one of the funnest matches I've had in months.
TL;DR: Riot's Leaverbuster system cannot differentiate well enough between a harmful/intentional AFK and an error on their side. Until it can, get rid of it and its "I agree" garbage.
Rant complete.
EDIT: Sitting on Avarice blade for 35 minutes definitely helped get the win :)