It's worth noting, too, that Worf is an in-universe badass even by Klingon standards. He easily takes out Duras. He won a major Bat'leth tournament in Parallels. He beats Gowron to the floor in Apocalypse Rising. Later in the Dominion War, he takes on every single Jem'hadar in a prison and beats them all, which Mar'tok can't help but be impressed by. Late in the war, he beats and kills Gowron easily.

If Worf says the Mek'leth is better, then we should take his word for it.

Also, Gowron is a chump ass bitch and I'm tired of pretending he's not.