My opinions is known in the forums, and by Arturia.
To me the main reasons to buy emulations is thie following in priority:
1. They emulate the sound completely or very close to especially the speciel charistica and unique sounds the synth have that make it diferent from other synths. If t can do this, then other sounds and posiblities in addition to this is welcome.
2. The original features and possibilities are there, and can work like the originals - (many things don't), but where improovements to have the possibility to make things easier is welcome.
3. They can get close to the above using the original parameter settings.
4. Other modern features like reset posibilities and MIDI sync for Sequencers, LFO's and timelines and whatever, - and where also Aftertouch, Velocity and Polyphony, and also Playmodes and Unison with detune and stereo spread are a possibility to use.
5. Things that make it easy to work with the synth and in a DAW, and additional features like effects that i would like to have their own factory and user presets and alike - like for example "Wavetables" for synclavier...
6- The same GUI as far as possible, but also other additions is welcome because of more features, waveforms including inverse and alike, Sync, reset and phase settings etc...
I believe emulations have the best future if they do the above.
To me it's not enough just to have the GUI, even if i think many just like to have the same GUI and say they have a Moog Modular etc.. That's fine, but a GUI in it self is not a emulation. Especially the sound is the most important. ANd many would like the emulations to do the things from old music they love and that was a part of making the synths known to say it in a few words.
I think Arturia have a good base to work from. There is a way to go, even if the synths in many ways do well allready, but they have the possibilty to do the above i believe, and if so - then i think it will benefit Arturia a lot as well. The things i write in the forums and to Arturia is meant to be constructive critic and suggetions.