Honestly i think your stuff looks more interesting and attractive because of all the effort and detail you put into it, your things also look very modular which i've always wanted to try (I took apart all the details of your turret and i was amazed because all that was left was a very simple shape) I'm not really the best at sleek, whenever i make something that's organic shapes i'd be very lucky to have it turn out as a good model.
I should take some of your details and add them to one of my mechs, i think that would looks siiiiiiick.
also last thing, the easiest way to make something "organic" is to use the push/pull/scale method (push pull and then scale one of the top surfaces and repeat the process) idk if you already knew that method but if you didn't it's very useful for me.