I personally prefer the TOS/TOS Movies personality Klingons. Intelligent and ruthless.
I have to agree. I think Martok was the closest to that that we saw in DS9. He wasn't so quick to fly off the handle.
I do agree with others that they should have showed more of the Klingons. I'd like to see an engineer of theirs fixing a major problem so that we find them more believable.
Honestly I really liked the simplicity of TOS when it came to enemies. They could have stuck with these antagonists and fleshed them out a lot more, perhaps even combining elements they would later use for Cardassians and whatnot.