well, i understand the disparity between rogues and other classes on ST targets. but make no mistake, rogue ST will get nerfed before live or very shortly after release. they are the extreme outliers at the moment. but you are right, their burst on such short CD (and even shorter with legendary boots) is too powerful.
those are my buddy's logs and i honestly think hes an amazing rogue. rarely have i seen anyone pull numbers like he does and i've been trying to clear +10 at the moment so i've seen my fair share of rogues. out of those rogues, i'd say about 30% have good aoe while the rest have super garbage aoe. which tells me that the skill cap for AOE for this class is fairly high.