Macs are actually very good computers and WAY better than windows. They are built better, faster, and sleeker. They just don't support games very well.
I know, macs are very good (I had one for 5 years). However, when it comes to gaming, you are WAY better off with a windows. Also with windows there are much more options for customization. On my old mac from 2008 ($1200), I would play on short render distance, 1280 x 720 resolution and fast graphics. I would usually get 30-40 fps. On my new windows ($800) I play on 1920x1080, 128x128 texture pack, fancy, and get 120-300 fps.