Executive orders aren't the problem. Bypassing the US system of government altogether and ratifying game-changing treaties and agreements through international law and the UN is the problem.
As is his attempt to unilaterally declare Congress in recess, but that was smacked down by the courts.
Teddy Roosevelt made recess appointments while Congress was out for lunch. This is obviously something that's up for debate, but let's not pretend like there was no precedent for having a different definition of recess.