Trump did better during his mid-terms then practically any predecessor and his approval ratings were recently higher then Obama at the same period of his presidency.
They lost the house, that’s the real test of a president’s midterm. It normal to lose some seats and same thing happened to Obama, but even still the shift was unusually large.
Such shifts are likely very good for countries over time.
The biggest risk for China is the system failing. Mao was being given bad data because the system in place rewarded people lying to those above them. This becomes common in many dictatorships. Eventually you get a lot of ‘dumb’ choices because accurate information is really important for any government to function.
> [...] his approval ratings were recently higher then Obama at the same period of his presidency
That doesn't look to be correct. Scroll down on this page [1] for approval, disapproval, and net approval comparisons between Trump and all past Presidents back to Truman at the same points into the term.