I cant see spawn as a problem anymore. Todd Mcfarelane will team up his characters with anyone. I have a Sonic Comic on my computer where he teams up with spawn and friends. I also have one with sonic teaming up with the punisher.
Grayson is pretty cool as a character but you have to remember that he doesnt have the rich guy persona. And also that he is a kid. Not everyone gets the kid as the hero story build up ( not even the writers).
I have to constantly tell my friend this cause he hates stupid male characters. The reason why they start out stupid and know nothing is for build up. It would be even more retarded if a hero just comes out and automatically knows all his powers. Just look at the spider man storyline. It remains uniquely the same because it works. He doesnt know everything at first. He still has his comical moments but he is still a badass in some respects.
You also need to remember that this is the comic universe and when you go to the story to buy a comic, its all about what person you want to follow. They all have their own comics. If you dont like grayson and like bruce wayne better buy a bruce wayne comic. if you like venom more than spiderman buy his comic. Most of the comic books intertwine anyway and lead back to the main story. (Uncanny X-men to Xtreme X-men spin off back to uncanny x-men).