Zodd is pretty badass but he's an apostle while Gutts is just a human. Random Gutts facts. I haven't read the manga in years so it might be old... it also might not have been in the anime, I don't remember.
~ Mother died when he was in her womb, so he gave birth to himself. I think travelers found him with the umbilical cord still in tact or he ripped it off himself, I forget.
~ Fights a pack of wolves when he was 11.
~ A succubus "seduces" him with plans of sex and assassination (obviously). As she transforms back to her normal form, he kills her because apparently he was really tricking her to sleep with him so that he could kill her. Mindgames.
~ Has a crossbow/canon or other weapon as an arm. Shoots it with a trigger pulled by his teeth. (I think? I forget...)
Edit: I'm not saying the animation is bad, just that it's old. Some people just don't like that old kinda looking anime, you can tell the difference between a picture from ten years ago and one from now. Old doesn't mean bad. I really liked the fight scenes and such, it has a lot of beautiful scenes.