Opinion on the game idea

Okay guys, its the first time for me using that topic.
Im making a game inspired by Dota 2, Combat Warriors, Critical Strike.
What do you want to see in game with the gameplay that looks like this:

  1. Pick a class
  2. Spawn on the map
  3. Kill the mobs to get the gold
  4. Buy items/weapons to dominate other players

Each round supposed to last around 20-30 mins. I need the game to have the good replayabilty and interesting gameplay, so most of the players would enjoy.
Since game is a RPG styled, player have attributes that can buff speed, magical damage, health, mana and so on.