Some changes from the DnD rules are needed, otherwise the fight at low levels would be quite limited. Due to the fact that if a player becomes discouraged at the beginning of the game, he will most likely just return the game.
You level up pretty fast in the beginning, and many games limit your actions/abilities at the beginning so players can learn. If fact, I would say it's expected that the player is limited at the first. If someone is rage returning the game because they can't do much at level 1, then they haven't played many games.