Time and again I fail to see how people can be so blind and complain about all those bonus loot chances they are given today.
You know, before an LFR tool was introduced there was literally no other source for items than 5-man heroics, valor vendors and maybe a PvP boss once a week. You should consider LFR and bonus roll a mere chance to get more; it is and was never meant as a way to gear up quickly, thus the high RNG factor. If you get nothing or end up having the same piece handed to you three or four times then it is fine, since you know you used the chance and just weren't lucky enough. Stuff happens. The real game takes place in normal and heroic mode raids anyway.