More time, heart and money has gone into this than any other free game I can remember playing, and I think Riot Games is going to make good on its promise of post-release development. Until further notice, this is the DOTA game you should be playing.
Once you're onto the medium levels and beyond, you'll be cajoled into smack-talking the level designers and laughing like a drain when it all slots into place, as if you're exacting some strange form of revenge by solving their unseemly riddle. It's that kind of game.
The core of Counter-Strike: Global Offensive is a reminder that quality can be permanent rather than fleeting, and the new additions give us new reasons to take interest and - hopefully - another way in for people who are ready for something different.