Well, that's your opinion and you're free to have one as well, so I'm not trying to bash your opinion, but to justify mine:
Batman is not the only person who lost someone important to him, but he is the only person who takes that way to far. It's an obsession for him to avenge the death of his parents.
If that would have been the starter for all of his adventures, it would be a different thing, but the writers decide to bring his parents up over and over again and it makes him look weird. Like he had some mommy and daddy issues and now he can't live without his own personal war, because they're dead.
Batman in a nutshell: A guy who dresses up as a Bat and strikes fear into the hearts of the cowardly suspicisous or something like that, damn I don't even know how to write that.
That's Batman and there is not much more to it. Nothing funny about him, nothing intriguing about him.
If the only unrelatable thing is his money, then you clearly don't know what you're talking about when it comes to Batman.
Batman has many other flaws.
He hunts down his enemies and puts them into Arkham. They break out, kill 1000 more people, he hunts them down, puts them into Arkham, they break out again and kill 1000 more people. If someone kills one of his villains (Nightwing > Joker), he is there to save them for pathetic, stupid reasons.
Batman recruits children over and over again and puts them into danger without any protection besides the training he has to offer them. For the most time he sees them as soldiers and lets them patrol the city with him from the very first beginning.
He doesn't try to find a new meaning in their life, or to train them for 20 years until they're grown up's, no. He immediately drags them into his own personal war against crime.
Batman has no morals. He likes the fact that he is needed and when every single one of his enemies would be gone, no one would need Batman anymore. And because of that he also recruits Robins, so that he wouldn't be alone.
Obviously this last two sentences were now heavily based on my bias against Batman and his entire universe.
Batman has been the exact same character for over 75 years, but who cares? Spider-Man has also always been the exact same character, but Spider-Mans parents died, when he was a child, his uncle died, who he admired - and he was basically indirectly the reason for that and Spider-Man is still able to live a regular life and don't be as obsessed as Batman.
Obviously it's all about characteristics and you can't judge Batman, because he isn't as funny or as witty as Spider-Man, but you can judge him, because there is nothing else to Batman, besides his ... "uhuhmmmmm I'm a loner, I'm the night, I'm Batman, I'm so lonely..."
Nolans Batman movies were successful, because people are victims. If they were smart, they would realize how many flaws the movies had, especially the two last ones. How much cheesyness there actually was in these movies, how many plotholes and so on, and so on.
(The same applies for Superman Returns, since there was a big, big, big, big, big flaw in the movie, but not that it matters, because the movie was boring and bad overall)
Batmans entire success is there, because he is overrepresented in the media. How couldn't he be, when he was one of the first comic book characters and had sooo many memorable moments in the media. But does that make him a good character? No, it's all about the environment he was in during these particular moments.
