Completely agree. To approach it black and white is wrong. Clark is a multi -layered character and I hope the movie shows that. Or even through the course of the trilogy.Clark Kent can't be just a disguise...because Clark Kent is the personality/person who was around before Superman. He is the morals and values that the Kents inspired, and Clark Kent's experiences, hopes and dreams. But he quickly began to discover that he wasn't just Clark Kent.
Here's the way I look at it: He grew up as Clark Kent, discovered he was Kal-El as a young man, and combined the two to become Superman. He uses elements of his public Clark Kent presentation as a disguise for Superman later on...but Clark Kent is still a very real person who shows his true self to his closest friends and allies. So he's very real.
But So is Superman. So is Kal-El eventually.
This character is unique in that he's not "pretending" to be these distinct things. They are not "disguises". They are all key parts of who he really is. Clark Kent is very real. So is Kal-El. So is Superman. And that's the way the film should approach it.