Someone on a Batman Facebook groups thinks Schumacher purposely made B&R bad

I believe he said he did because he didn't like making them.

Doesn't make sense, he came out and apologized for Batman and Robin and accepted responsibility for it. He never tried to blame Warner Brothers for it.

I get the impression that Joel Schumacher is essentially what you could call a studio director. What that means is that he's a very pragmatic filmmaker who will do as the studio requests. He will generally produce the safest product possible, which leaves little room for amazing works of art, but still decent and sometimes good films. It's arguable that Schumacher is when you get right down to it, a director in the TV mold in that once you give him a script, and he'll bring you movie on time and on budget. How good the film is depends on the quality of the script. It's unclear that his better films were how much due to his own skill as a director.

With all due respect to Joel Shumacher, he at the end of the day can for the most part, be considered a good director (at least on a technical level), but nothing approaching an auteur or a strong creative presence. I mean a director with more artistic clout would either not take the scripts for the two Batman movies (especially the latter one) or at least greatly alter them into something more than what they were. But it's safe to say that Schumacher bowed to the studio pressure for a more marketable, cartoony film with no regard for making a thoughtful or artsy movie out of the mess.