Nice of you to post some tutorials. I'm in the works of producing some more advanced tutorials myself, with focus on multiaxis machining. They are still a bit from being released though.
You ask some about the general view on Pro/NC and I will try to give you mine. I admit I might be a bit biased towards Pro/E and Pro/NC since this is the program I use professionally and have the most nowledge of. This being said I do think that Pro/E and furthermore Pro/NC is the most competent CAD/CAM package out there.
The thing about the steep learning curve is right; it does take much longer time to master (or even start) with Pro/NC over most other cam systems. Now why is this? In my opinion the reason is that Pro/NC is very versatile, you can do almost anything with it.
Pro/E and Pro/NC are initially meant as a highend program for larger coorporations and thus it needs a proper configuration depending on what you are using it for. Many smaller companies buy the package without proper configuration and/or training. But yes, either way the learning curve is still steep. Also there are numerous ways to do the same thing and which way is best is often depending on the design intent, ie how you build your model/nc and for what purpose. Also it's heavliy based on the users input, so that every model is fully defined. In many other packages you can build your models and/or NC paths a little less constrained which could be a nice thing but on the other hand it doesnt have so many options.
With the above being said, I'm very impressed with all the features in Pro/NC. Again, there's (close to) nothing you cant achive. The steep learning curve is also being adressed by PTC by simplyfying the UI and developing new and easier modules. For example a new module is being launched now, Pro/TOOLMAKER which allows the user to more simply create tools and toolpaths. I havent tested this fully yet so I dont know the final result, but I suspect the user will have some constraints contatrary to running the native Pro/NC.
Also, I'm a bit surprised that for example mastercam has a market given ProŽ/E's aggressive pricing in the last years. A full 5axis maching license is cheaper or on par with the same options as mastercam, but with Pro/E you get a fullfledged CAD system also.
I think you will see the largest effect of Pro/E when you are having an CAD/CAM integrated development. I.e where you both design and manufacture your models with Pro/E. Why? Because there is no better package that deals with associative, featurebased modelling. This simply means that if you design your part in ProE and the apply your toolpaths, the designer can update/modify his/hers model and the toolpaths will update accordingly. For this to work smoothly both designers and Pro/NC ppl need to know what they are doing and why and this is clearly one of the places where only experience will help you.
My 2 cents,