Surprised there hasn't been much reference to DotA in this thread. Couple of things no one mentioned..
HoN is based very heavily on DotA and and a ton of the heroes have identical skill sets or mixed and matched skill sets. The devs have frequently looked at the latest DotA patches and applied some of the things IceFrog (DotA's dev) to HoN. In my opinion HoN is a game that is trying to be DotA but different at the same time and it just doesn't work for me. Last time I checked, albeit a while back, DotA's competitive scene dwarfed the likes of HoN and LoL.
Pendragon used to work on DotA with IceFrog but is now part of the LoL team, there was actually a pretty bad disconnect between the parties. See link below.
Valve has recruited IceFrog to work on DotA 2, which is simply going to be amazing. IceFrog, essentially the creator of the genre, is being paired with a great gaming company in Valve. DotA is still where its at as far as this genre is concerned and DotA 2 has potential to really put it on the map.