I recently discovered this whole “Groove Agent” thing, went thru the confusing and uncomfortable process of getting it working, and so I would definitely agree! Actually, I’ve been on Nuendo forever, but never even knew it was in there.
The positive is that it’s a huge asset to have Drum Editor and Drum Maps in the DAW, along with this integrated tool to host the sounds. The negative is that it is catastrophically unintuitive and frustrating when going even one level deeper (making and saving kits, mapping to keys, dealing with the “oops cannot find your sound” hassle, bugs where it randomly becomes unmapped and won’t pass sound, really ugly and counterintuitive browser, etc).
The concept is really quite simple, and it should not be impossible to make a bugfree and intuitive interface to do this task.