Who is more upset by all this? DU or the presstitutes who were foisted on their own petard for all to see? 
I like that. A lot.
I don't have a problem with it at all as long as the President is very specific with the information. The public could use a thorough education on exactly what the Obama character did against this nation and exactly what it is going to take to repair the damage. The public needs to know that President Trump could be doing other things if he didn't have to save the nation from the last administration's purposeful harm and destruction.
I agree that he should point out that there is a lot of clean-up to do. It just shouldn't become a refrain like it did with Obama.
"Obamafail is a colossal failure, and we're going to fix it, and here's how." Say it once, say it forcefully, and then get on with the business of doing what he said he was going to do. Broadly-speaking, it appears that he is generally following this formula, which is fine with me.
In the same vein, I think he probably needs to dial it back a little bit on harping on the press. I get it, and I agree with him, but too much of that will eventually make the press look sympathetic. He's gotten the message out there; it's OK for him to let surrogates carry the ball on beating the MSM about the head and neck for a while. If he keeps doing that, it winds up sounding like whining, just like it sounded like whining when Obama blamed everything from a bad economy to his dog shitting on the carpet on "the previous administration."