The reason people comment on a president’s first 100 days is pretty much all down to FDR, and the beginning of his first term in 1933. So while people opine on Trump’s first 100 days of his second term, I think its important to look at what an intelligent and capable leader is able to achieve, versus the unthinking and incompetence we are seeing these days.
FDR achieved so much because he was a leader with a vision and a plan, not a egotist with a victimhood complex, and a list of grievances.
As a quick example, look at these points from his First 100 Days wiki entry:

When you are a good leader you don’t have to bully and cheat to try and get things your way.
I don’t want to risk turning my first post in ages into a rant about Trump stuff, but thought that this was worth noting as I always hear about someone’s ‘first 100 days’, but never really knew what could be accomplished in such time.
FDR built the seeds of what would make America dominate in the 20th century, and now Trump is sowing the seeds of the destruction of America’s reputation and soft power.

Luckily he wont have 4,422 more like FDR did, and is stuck with only 1,361.