Pretty good, and steam aint bad.
After weeding out the blind ignorance in other reviews about steam, and reading the real content regarding the GAME, I bought it.
The GAME itself is pretty great, fun, lots of hours of entertaining stuff. Some really awful tough parts, but ymmv. Def worth it, replayable, long standing stats n stuff. All is good. I notched a star because its a bit dated in parts. Oh well.
For those who can't read "Requires Steam for activation" is right there on the page. I saw it. I see it. It also doesn't mean anything negative because I have known and used Steam on the pc platform for years. It is the only good service out there for pc. Not sure why they wanted to bring it to mac, but thats not the point of this review. The point of this review is... don't diss the GAME (or this store) for your own ignorance.