I actually think as far as DC goes, the secondary characters standalone films sound more enjoyable than the big ones like Batman vs Superman and Justice League. The bigger ones follow that Avengers formula and throw far too much in. Too many characters, too long, but where they differ is in a big lack of fun. They're so relentlessly serious. Plus Zack Snyder is an awful director. He does money shots but doesn't "direct." He made a superman film that was no fun. His other Marvel films look dull too.
The Wonder Woman trailer looks sort of fun, and she went down quite well in BvS. Aquaman has a good director on board and he wants to go for a mix of Romancing the Stone and Indy Jones, so that means he'll opt to make something fun. Hopefully he'll deliver. Plus we've already great Batman and Superman films. Retreading the ground is boring. It's like all these Spiderman reboots all the time. Dull. I'd rather watch something a little different.
And yes, this could mean a recurring role for D. It's a guaranteed box office hit.