...but also have cloaking devices. Because having an honorable battle with a worthy opponent means you should sneak up on him to gain the upper hand.
I brought that up in the "Treaty of Algeron" thread. In ST3, it was going to be a Romulan Bird of Prey, but the villains were changed to Klingons. The BOP remained, complete with cloaking device, and it became canon that Klingons could cloak.
It ends up making no sense. The only reason the Romulans were anything was because they had cloaking technology, and they would rather kill themselves than allow it to fall in enemy hands.
It ends up spoiling who both the Klingons and Romulans are. The "canon" explanation became that the Romulans and Klingons had a short-lived alliance, and shared technology. Psh, as if. And to make it worse, we later see proto-Klingon BOPs in Enterprise. Uh huh...