Sins of a Dark Age is a Free to Play DOTA2 clone. Give it a try.
I am not much of a MOBA player, except played and enjoyed Infinite Crisis casually.
Differences maybe is:
Embark on Quests: Adapt your strategy as each adventure includes a series of tide-turning Quests. Fend off swarms of plague infected vermin, resurrect the undead, steal a Troll's treasure, or feed and raise a powerful Gryphon! Complete quests to earn unique advantages that you can use to crush your enemies!
Before the game starts players are able to customize their hero’s core attributes (much like in a traditional RPG) to best suit their personal play style. They can also equip hero specific gear that can alter abilities used in the game.
- The Vice and Virtue system rewards good behavior with free loot and punishes bad behavior by denying it. Report and mute toxic players easily.
- Shared gold ( with a twist) means you aren't fighting with your allies and supports can be supports.
- Low level and under-equipped players are scaled to match the most powerful player in each session.
for more info:https://en.wikipedia.org/wiki/Sins_of_a_Dark_Age