I nearly stopped reading at, "arbitrary set of parameters"...And I suggest any potential buyer/demo-er synthesist possessing the slightest amount of patience to -learn- a software do the same. Absynth's interface is the only issue I've personally ever had with the synth, however be aware that with a proper understanding of this instrument there are sounds and performance features to be had that young lad Massive can presently only dream to achieve.
I say these things being a owner of the nice Massive synthesizer myself. One must have a massive amount of respect for the Deep programming potential and complex modular synthesis that Absynth can provide the right user. I would even go so far as to say that Absynth is more than likely one of the most complex software synthesizers ever developed and requires a good measure of patience/study (versus a need for instant gratification) in order to understand that statement.