At first I was crazily excited about Dota2, because I was hoping for the best of the original game added with Valve usual ease of access but alas, it's not to be.
It seems DOTA2 will change little from the original except update the graphics and a superior matchmaking by Steamwork but if you dreaded the hour long matchs and the dismissive attitude toward noobs (who can easily make you fail by giving enemy heroes levels) greatly diminished my interested on the title.
If you are in love with the original, this game is for you, but if you hated some aspects of it, I don't see it changing.