Pretty solid start for a series.  There's a huge cast of characters who have various forms of address so it can be difficult to keep track of everything in the beginning.

The dynamic between Wei Wuxian and Lan Wangji is hard to describe of only because you don't know the whole history they have yet, nor where it will go in the future.  So far, one is basically a class clown/jock type while the other is a stoic nerd type and I'm having a great time with it.