In my experience, weekends have a lot more clueless folks queuing for WZ at all levels (10-49 and 50). If random variation puts a lot more of these folks in your team then you are screwed and you simply must take your lumps.
BTW, were you solo pugging or queuing with others?
2 of us, heal - tank combo. I almost never solo queue for 50 wz, mostly 3-4 premade, which can pretty much carry a huttball team (Sage, Tank Vang, Sentinel, only wish we also had a Shadow/Guardian for a perfect team