I know some people loved Groove Agent for its preset patterns and complexity slider. But that always seemed sort of gimmicky and toy-like to me. It was like the drum machine equivalent of a home organ with goofy auto-accompaniment styles and patterns. Again, that was just my take on the instrument.
So when I saw the new Groove Agent SE in Cubase 7.5, I thought, “Right on! This is the Battery killer that I have been waiting for!” The only thing that is missing is a built in step sequencer. So if Steinberg can combine an improved version of the Beat Designer MIDI plugin with the sound engine and interface of Groove Agent SE, that would be awesome.
Preset patterns (with a complexity control) could be cool as well. But I tend to program my own drum parts.