Teen Titans had its Fourth Wall humor, but they didn't abuse it like a dying dog with cancer like in USM. USM has sooo much unnecessary jokes and 4th Wall humor. Teen Titans also managed to make their show pretty dark but then again, we're just at two episodes into USM (tho, judging by the tone of the first two episodes... i doubt we'll be getting as dark as Teen Titans)
The thing about Batman and the Bold is that the writing and animation fits the tone and humor they're going for. The drawing isn't too detailed and is reminiscent of the classic Batman cartoon from the 60s (?). The jokes are really fourth wall humor and self contained in its universe. USM on the other hand has superb animation that would fit a serious or at the very least, not a poor-'comedy-show'-for-kids. The humor or at least the delivery of them feels unnatural and constantly making the audience know it's not to be taken seriously, losing that tension found in many cartoons that makes them engaging or even worse, interesting when watching USM.
I REALLY hope they fir- I mean, replace the guy(s) responsible for enforcing the humor of the show. If i was the guy behind the audio, doing the audio cues for the humor, I'd feel ashamed of reusing cartoon sound effects from the Hanna Barbera cartoons.