Well, I'm completely immersed in this.
Sitting around 22-22 and trying to play as many heroes as possible, get to grips with their mechanics... But I've definitely got some favourites already.
Jungling Ursa, rushing for a Vlad, taking Rosh at level 8, snowballing into tarrasque/S&Y, then absolutely storming their high ground and just being unstoppable. I'm lucky to have started off playing with some really good guys that enjoy playing support, to allow these things.
Yes, no-one likes to play support, but everybody likes to win.