I have had my 2014 LG 42LB6300 for several years now, but one thing that bothers me the most is that I am not able to fast forward or rewind when I am watching movies (DiVX) from my Zyxel NSA221 NAS (DLNA support). It works perfectly from my 2011 LG 55LW6500 which does not have WebOS.
I also works when playing movies from USB stick or HDD, so it must have something to do with the XFS (or EXT4) filesystem.
In addition the TV will sometimes just stop the movie halfway though and start loading the next movie. I don't think it is an issue with my network since I have Gigabit throughout the house.