Double CC happens even without high latency, but ye, latency makes *** happen more often. I can't tell you how often I'm hit by 20 meter range Dawnbreakers and Uppercuts, or shot to death through walls, etc. and that's just with 200 ping...
The double CC has only really started happening since Summerset I think, at least I didn't notice it before and I used to PvP way more back then, so I wonder if they'll be able to fix it. It also seems to be worse with some abilities than others, the Time Stop psijic ability is usually always the worst one for me as it seems to combo with other stuns to make them unbreakble.