I've never quite experienced the RNG-ness of loot as much as in this patch.
I dinged L90 like 2-3 days after MoP launched... I've crafted my ass off, bought all the best epic gear I could find... BMAH included. Raided my ass off every week, needless to say I did tons of effort and really wanted to be in topnotch gear again this patch around.
However... the RNG gods have struck me down from my plans... I'm running around in ilvl 477 gear while some people who don't even raid are running around in almost ilvl 490 gear.
First, there is the lucky coins. This just makes loot even more RNG ... All I get from it is gold, gold, gold, gold, every week gold. Other people get their tierpieces, BiS trinkets, BiS loot overall almost everytime they try to use a coin.
Secondly, the outdoor worldbosses seem to be screwing me over too. I'm not sure if it's the new lootsystem but I've never quite felt like having such a low chance or success on getting loot from bosses (same in LFR). I've done enough effort to make sure I can kill both Sha and Galleon at least once every week, yet ... same story again, gold, gold, gold, gold, gold... while a friend of mine has gotten loot almost every kill and a fricken epic mount on top of it.
It's very depressing and not fun to be shafted like this by RNG on loot. When you put in as much or more effort as others and the new luck based lootsystem is so heavily fucking you over. The lucky gold coins... I'm starting to hate the feature, I'm also starting to hate the worldbosses with their random chance on dropping tier items.......