I don't think this is about talent disparity. I honestly think that the Wiz and C's are pretty similar teams. It's just shortage of talent in general. People are expecting too much from guys like Crowder, Bradley, Smart, etc.
Let's face it: none of them are stars in this league. Countless guys have said it (Pierce, Doc rivers, etc.) but the biggest difference between a good player and a great player is consistency. JR smith is a pretty good example of this. Dude can be a flame thrower on offense and has all the athleticism to be great. But he isn't. Granted, some nights he can bury you. Other nights, he can't.
What we're seeing is pretty much the symptom of what all of us have known for much of the whole year. This team isn't on that next level yet (and neither are the Wiz for that matter).