A good programming editor must treat code constructs as first-class citizens and (at least partially) operate on AST level, not go with typical "hey, we have a bunch of text that we colorize and bracket-match/fold/dissect with some mostly-working regexp mess¹" approach. The latter is just a notepad, not a decent development environment.
As I suspect this editor isn't much different from notepad/textmate/sublime in this regards and it doesn't really understand a thing about the code I'm working on (just pretends it does), it seems quite useless to me.
___
¹) Like this: https://github.com/atom/symbols-view/blob/master/lib/.ctags
I don't really see what the advantage of putting ST in the App Store would be, though, for either its developer or any of the users. I like the App Store well enough for certain things, but for developer tools and many utilities the sandboxing tends to be an annoyance at best.
(Also, I don't like that the App Store makes upgrade pricing completely impossible, but that's a whole different rant.)