True enough, Dota itself is a team game. It is proven that, a
single hero will not win over 3 or more heroes on NORMAL
basis.
But then again, Its we players who actually experiment the game.
And eventually find out some other ways to play the game as
well.
True enough, perhaps 1v1 dota defeats the purpose of DOTA but its
fun nevertheless. Besides, there are also competitions for it. So
somehow, Its actually recognized as a different playing way

EDIT:
To add, Im sure some of you might had played some draft matches
before as well. And often there will have a single hero soloing;
Viper, Warlock, Qop, Thd etc. etc.
So perhaps 1v1 dota isn't that dumb, But perhaps it might act as a
training to the form of LANE CONTROL. Which isn't so bad after all?
What say you guys?