The issue I have personally seen with WDI is their hires all start out as interns, often with no background in the parks, just whatever their degree is in. If they are pretty girls they end up with jobs in Imagineering. If they aren't pretty girls, unless they are REALLY good at what they do, they are replaced by another intern. They rarely hire anyone from within the company who has actually worked IN the parks.
I know three people personally who were in ride operations at Universal who were then hired into UC because they actually want people who understand what they do and not just how to insert hidden mickeys and little nods to past Imagineers. I still think Imagineering can do great work, but often they seem to miss the big picture because the people making the decisions and plans have no idea how things work in the real world of the parks.
I know there is a balance of fresh ideas from outside and experience from the veterans and I think UC is closer to that balance than Imagineering is at this point. The "great" Imagineers were people who worked in the parks and saw what happens and came up with ideas to make things better.