Traffic was terrible. I almost missed my flight due to taking a bike over a car, but then it started pouring rain and I had to huddle under a bridge while I waited for a car.
Jakarta has a noise problem. The temples blasting the prayers is disruptive to sleep and inner peace. The traffic does not make anything either.
Also, Indonesian food IMHO is at the bottom of SEA food culture. MY has wayyy better food (both in quality and diversity).