This game is a masterpiece
One of the best additions in the game is the Create a Hero it anables you to create a power character with many powers and can change the tide of the battle in seconds.
The units can be very complex and each faction has very different play styles such as goblins have are fast, cheap and weak units and the dwarves have slow, expensive and strong units.
Another good addition in the game are the powers which you buy with points which are earned by killing an enemies units or destroying an enemys structures. The powers are very good they can give your units buffs and the enemys units debuffs you can summon powerful units such as tom bombadil he is very powerful and can wipe out very strong units in seconds, or you can summon an earthquake that can destroy structors and kill units very quickly.
Each faction has many different units and structors, but some units are more difficult to than others and each units have advantages and disadvantages. There is a ranking system that indicates how easy it is for a new player use a given group:
1. Mordor
2. Goblins
3. Dwarves
4. Men of the West/Isengard
5. Elves
This means that begginers should stick with mordor or the goblins, the gradually work you way down the list. Note: that the elves should only be used by the experts only because the ability to stay in the battle for a long time.
This is a very good game and everyone should give it a try.