how is it that yesterday I farmed the act 3 key all day long at MP 2 and never seen it drop.and 1 more question just wondering if there are any other classes out there other than WW barbs that have 100 paragon already I got about 400 hrs invested and am only at mp 20.
You're doing something wrong. Wait, no... You're definitely doing EVERYTHING wrong.
400 hours and you're paragon 20? I've got 125 hours on my WD and I'm PARAGON 55
... I also have the same amount of elite kills, in 1/4th the hours played.
Farming MP2, and you seriously expect to get key drops? I wouldn't even CONSIDER doing key runs under MP8... Even if you are under geared, its not like MP5-6 is unbearably difficult. These days, it costs like 500k gold to gear ANY class to be able to handle MP5-6... Farming on MP2 for keys is simply nonsense, and a total waste of time.
You need to learn how to farm efficiently before you come to the forums complaining about drops rates, or ANYTHING else for that matter... because you clearly are simply not doing it right. I'm not even trying to be elitist... just telling it how it is.