I generally disliked the designs. Not because I saw anything particularly wrong, but there's not a lot special about most of them.
And it only gets worse when you get new armor sets. Like, WTF is this:
And you think oh it's just Reyn, I don't take him seriously anyway. And then this happens:
BTW this is Shulk if you can't tell.
Da fuq is this? Why does this set turn Sharla's hair orange?
It gets to the point where I don't even use heavy armors because I'm so embarrassed for my characters. The only armor set I truly like is the Alcamoth style gear, and it does not really suit most of the characters very well (Sharla looks especially weird in it imo).