The second time, I played as a Mage. And you know what? I really, really liked the Mage class :) Not only is it just cool, but it's also fun! Oh, how I laughed when I froze a sharp turn (90 degrees) on a cliff. The Orcs run after me, slip, and fall off the cliff, hitting their heads hard on the boards they slipped on))) Or shrinking enemies down to the size of a cat! My younger brother (6 years old) was lucky enough to see me use that spell. There was so much laughter, both from me and from him!
I started playing as an Assassin a couple of times, but I never finished. Combining specializations doesn't always bring the desired result. It's better to level up a pure Warrior/Mage/Assassin; it's simpler and better. In general, for a complete picture of the game, it's best to play through it 3 times with all 3 specializations. Personally, I got the most enjoyment from the Mage hero.
Bow down and hear our cry,
Our earthly rulers falter,
Our people drift and die,
The walls of gold entomb us,
The swords of scorn divide,
Take not thy thunder from us,
Take away our pride.
G.K. Chesterton: English Hymnal