"Teh lulz" is a point of the video. Because its just funny and pathetic a bit. People usually turn off exp on this bracket because they enjoy TBC content and they wanna pvp like in the old times. Everyone have a pvp gear, everything seems balanced, but then a ret appears and BOOM HEADSHOT! You have no idea what happened, why is your character lying on the ground and generally "omgwtfface".
It means that low level pvp is ruined due to the new, unbalanced skills. Even resilience cant fix it.
I remember that after many bgs like these hordies were really pissed off and they just wanted to kick my ass in group xD.