I liked him because he wasn't as uptight like Worf was.
YES. That's one of the reasons why Martok beats Worf as my favorite Klingon. Most of the time, Worf acts like he was born without a sense of humor, but Martok seems like he'd be a fun guy to be around.
To be honest, with Worf being as dead serious as he is, I always wondered what that jokester Jadzia saw in him.