I like Adcenter but it's frustrating to have to submit every adgroup, every day. It's better now you have added the ability to submit adgroups in batch, one page at a time, rather than each adgroup separately. But it would be much better to get rid of this step.
With Adwords, for example, you create an adgroup and that's it. This stage of submitting the adgroup each time realy needs to go.