What are the worst parts of D?

[Tofu Ninja via Digitalmars-d]

There was a recent video[1] by Jonathan Blow about what he would 
want in a programming language designed specifically for game 
development. Go, Rust, and D were mentioned and his reason for 
not wanting to use D is is that it is "too much like C++" 
although he does not really go into it much and it was a very 
small part of the video it still brings up some questions.

What I am curious is what are the worst parts of D? What sort of 
things would be done differently if we could start over or if we 
were designing a D3? I am not asking to try and bash D but 
because it is helpful to know what's bad as well as good.

I will start off...
GC by default is a big sore point that everyone brings up
"is" expressions are pretty wonky
Libraries could definitely be split up better

What do you think are the worst parts of D?

[1] https://www.youtube.com/watch?v=TH9VCN6UkyQ