Skyrim has a very interesting combat system. A player can take different weapons in both hands. You can take a sword and a shield, two swords, sword and magic or you can equip magic in both hands (your magic attacks will be stronger). It is a new system never used in other games. You can combine magic and swords as you wish. You can create a strong combat mage or even a paladin. Every combination of skills is playable and strong. Game is balanced very well and a true mage is as strong as a warrior.
The other interesting feature is dragon shouts. You can learn different shouts and use them during the fight. They are very helpful against strong enemies. To learn a definite shout you will need a Dragon Soul. A hero absorbs dragon souls after killing dragons. All dragons are rather strong and fights with them are always spectacular and interesting.