Nothing annoys me more than assuming that everything created by adversaries of the Federation is useless
Especially the Cardassians
I don't think armour was useless, but I think the writers didn't really give a thought why it looked the way it did and didn't use the opportunity to make it something different.
In a Cardassian library
or in a Cardassian gallery
"Reagan, it appears, is really only an ardent unionist if the unions in question are in Poland" - Stephen King, Skeleton Crew