Yeah, I wish people would stop dismissing all the effort the Atom contributors are making by bringing up the 2MB file limit all the time. I've not seen a 2MB source code file (thankfully!) in a long time so it doesn't impact me. If I need to edit or search through a >2MB e.g. log or CSV file, I usually do that from the terminal anyways. The file size limit is a bit weird I'll admit but not a showstopper for me.
Their full screen bugs on OSX (possibly just when using multiple monitors) are what keep driving me back to Sublime. Large files can usually be accessed elsewhere; the inability to switch windows when you have unsaved worked over there is lost time/money.