Before then, there was literally no way to easily get every hero other then buy a Legacy Account. You had to unlock them all over time, or pay huge sums of money. And some people really do like HoN, I think the path they went down is pretty shitty, but opinions and what not.
I really have no idea who thought the art style was a good idea for the game though. Zoid, I summon you to tell me. "Dota 1 is a WC3 mod, and thus Gritty and hard to tell what is going on. Lets just do that."
I may actually go and try out the game some more after this, since I do want to reevaluate a few things about the game now that I have had a good 6+ months with Dota 2.
When I did it for LoL, it was more or less the Meta is the same, the strong heroes were changed up a bunch but still not really that balanced, the no CS for supports mentality that doesn't really work well at all in pubs due to how the scaling is had gained more root (Though I will admit, a carry getting an early lead is also even more important in LoL then Dota, due to how the more expensive items are actually more cost efficient too per stat too), the community was actually worse then when I stopped playing. But, on the bright side, people clearly bought more wards then they used to.