As a long-time Sublime Text user, I've made the transition to using Atom as my go-to code editor, and while I enjoy it's more hackable aspects, I hadn't been unable to find a monokai syntax-theme that felt familiar amongst the available prospects. I'm actively working to improve the syntax-highlighting for individual languages, so feel free to submit any languages you would like to see improvements on.
Update: I've also developed a complimentary UI for this syntax-theme, so if you like this package, check out Atomic Design UI.
$ apm install atomic-monokai-syntax
After installation, the theme can be activated by going to the Themes section in the Settings view and selecting it from the UI Theme drop-down menu.
For more useful packages, check out my Essential Atom Packages, which I'll continue to keep up to date as I explore and familiarize myself with the editor and it's community.
Good catch. Let us know what about this package looks wrong to you, and we'll investigate right away.