The only con I can think of is the difference of tone... they like making him gritty and grounded... of course when making these stories they don't use characters like Clayface. Even Ivy's powered down to just seduction instead of city leveling plants.

However, since... Morrison? They've been bringing back the sillier elements, and it continues with Snyder and King, who likes epic, and now we have Hugo Strange Kaiju, multiple Bat-Armor, Moon Batcave, ghosts of Arkham and of course, Signal and Gotham Girl, so the past 7 years it's already not the same tone as it used to be. Meta can work in Gotham with that kind of threat.