To be fair, a patch was recently released that changed the game quite dramatically, particularly with regards to the "laning phase", so you may want to look into that if you haven't already.
An average stun in DotA last about 1.5 seconds. The longer stuns last about 4 seconds and are quite rare. I think there's a single stun in the game that lasts 6 seconds (and is incredibly difficult to set up/land). That said, there are ways to avoid stun effects, remove stun effects entirely, and even make yourself immune to them. That's part of playing the game, knowing how to counter stuff like that.
I really don't understand why or how you feel it's "broken".
As I said, it is widely regarded as the most balanced MOBA out there.![]()



