I Absolutely Agree With That Assessment He Is Very Dangerous In His Ways And He Has To Be To Deal With All The Psychopaths He Has To Deal With On A Regular Basis:-)

Batman is a human without powers, most characters in DC could kill him before he can even react. No, he's not the "most dangerous". The only thing he has going for him is plot armor.

Take Reverse Flash for example. If he wanted, he could kill Batman in less than a second and there is nothing Bats can do since he can't even react to him.

Prep time Batman can slow down reverse Flash and hit him good

Everyone in the DCU has plot armor to a certain extent. It's a perennial rule of storytelling. The trick is hiding that dirty little secret to the best of your ability.

Besides, why would people want to be Batman to be a near-omniscient super-genius that solves every problem he comes across? Why would people want a story about a hero that always saves the day and never puts his friends in unacceptable danger? Where is the tension? Where is the drama?

Batman can wield a Yellow Lantern Ring. That gives him powers and makes him dangerous.

Batman doesn't wear a Yellow Lantern Ring all the time. When the ring chose him, he rejected it.

The Yellow Lantern Ring is not a gimmick, if he wore it only one person would be in danger: he himself.

It's also addictive like a drug which has been touched upon a few times. Even a demi-goddess like Wonder Woman felt the pull when she wore it. And let's not forget that Sinestro can just blow up the user.

I knew Sinestro would have a backup plan!

Anyway, I'm not trying to dispute the legitimacy of Batman's feats and accomplishments. It's just that some people are indeed more dangerous than him. It makes sense when you think about it. In most stories, the antagonist is more dangerous than the protagonist, who has to struggle to match and defeat him because that's the whole point of dramatic tension.