No, I will not try the game. Wrong genre and game style! Yuck!
I HATE sequels having numbers. Doesn't matter what it is (games, movies, albums, etc).
I HATE HATE HATE. It is cheap and uncreative.
Like John said, it needs to have a sub name.
What is absolutely stupid, is when creators give it a number AND a subname.
We aren't stupid, we can tell them apart >.>
Oh wait, Martin can't.
And yeah, why have a Dota 3? Seriously, it is pretty money hungry and it also suggests that they are going to leave gaps in Dota 2 so they have something left to make Dota 3 better.
Or, they could just do expansion packs or something.