How good is the NEM blockchain with respect to vision, development team and future applications?
take a look at nem.io the official webpage and the forum over there. Catapult is the next step and I would advise you to read about that. If you go back a few posts I posted the last official update from the foundation which is really worth a read too
NEM is a top 10 coin... it has original code base and innovation which is different from most other platforms
And the vision is one of the best the devs are working all the time to realize it