Don mills station is a clean terminus that is at the end of the purple line. Like a lot of the Purple line stations it's a huge cavern. It's deep in the ground and it's like you can fit a few jumbo jets inside it.
You have a passenger pick up area, a bus area with arrival times, a couple small shops for lotto and snacks, and Fairview mall.
I give it 3 stars because... Well... It's a subway stop. The words TTC and 5-stars have never crossed my mind. But it's a pretty good one as subways come.