Another issue I have with Poloniex is, you can't see anywhere how much you are up or down on the trade. For example, there is no place where it shows you are up, $200 or down $200. You just have to calculate yourself the difference which is annoying.
Am I wrong about this?
Not sure about about the exchange, but you can see your
current profit/loss in margin trading in the box next to the chart. Don't think you can see your overall P/L though, which I agree is quite annoying.