Game logs take up LOTS of space!
R3D logs (found in "...\LeagueOfLegends\Logs\Game - R3d Logs") from non-standard game modes (like Ascension) take up 50 times the drive space as normal games. As shown in the screenshot, the files from most of my games are around 200 - 500 KB depending on the duration of the game. The attached R3D log is the highlighted one, which is taking 19,105 KB. That's 50 times the standard log size! The majority of the lines in the file are:
> 000117.755| ERROR| Tried to get value on a stat (BOUNTY_LEVEL) that doesn't exist in this mode!
This may indicate a logging issue. So the developers should insert some code so it doesn't check for that stat in the relevant modes.
Also of importance, this directory alone full of R3D logs is nearly 1.7 GB! Are these logs never deleted automatically? Because, it currently contains just over 3700 items, consisting of a log for every game I have ever played since November of 2011...!
I think that both of these are issues that need to be addressed. Sure, I could just empty the folder, but think of all those innocent users with no idea how many bytes are being wasted. Those bytes could be used for so many pictures of cats! 
Screenshots: