The only area in where he's letting us down is his inability to give up his tweets. But then who expected that he would?
More importantly though is his stand on Syria and North Korea. I think it's the one area where is actually listening to someone other than himself. Because of that his views are shifting. That's being pragmatic.
He's finding he doesn't know everything. That's good. Because he doesn't. I'd really be worried if his attitudes didn't evolve as he gains more information to guide his decision making. If only Congress would do the same. Actually they've dug in their heels over untenable positions far more than the President.
He would appear to be learning that governing is no slam dunk. That too is good. So much is being made of his first 100 days. I'd give him a perilous "C". It could have been far worse. It should have been far better but at least the country hasn't fallen completely apart even though the anti-Trumpsters would have you believe otherwise.
If he continues to change his positions and they go in the right direction I'll remain cautiously optimistic. Very cautiously.