Some of the neg comments obviously not from actual pros targets for this machine. Price point -- seems reasonable and $ re-coupable for what you get. Plastic chasis -- ha. ha. Obviously a comment from an uneducated mud slinger. Cable snakes. C'mon what pro doesn't have to deal with that? It comes w/ the territory.
Personally, I'm out of the running for now as a hobby (up to now routinely spend $2200-2500 on MPs but that was total inc. HDs, RAM, etc, not just the starter kit), but if I were a pro what would bother me is only the promise of expansion by 3rd party vendors. The new MP clearly has lot of horse power the lack of TB, much less TB2 peripherals is a serious barrier to spending mega $ on a workstation. And where is the updated Cinema Display w/ 4K, USB3 and TB2?
The mini was the only Mac not updated last year so I'm hoping its because Apple will be beefing up a model for the hobbyist/prosumer market but wants to firmly plant the new MP as flagship first.