Talents, in a World of Warcraft account, are extremely important for all World of Warcraft characters. They are, the best way for players, aside from changing equipment, to customize their characters. Every class has three sets of talents, arranged in a tree. By training on the lower, simpler talents, World of Warcraft characters are able to advance up the tree and train my difficult and powerful talents. Their importance varies from character to character and from one World of Warcraft account to another. Not everyone uses them the same way, and not every class can get the same benefit.
For instance, for roguish World of Warcraft characters, talents are extremely important, since they are how a rogue learns more powerful attacks. For a paladin on a World of Warcraft account, on the other hand, some have calculated little benefit exists from the talents, simply because there are other characters that can do a better job. Still, talents offer a unique way of customizing World of Warcraft characters, and players seem to enjoy it. While there are some people who see the game as an optimization problem, learning how to use the World of Warcraft account to its maximum advantage, others see it more as a grand role-playing game and see little point.
Those in the middle simply appreciate the possibilities offered. Each talent tree focuses on a separate area, and there are limited numbers of talent points available to World of Warcraft characters over the course of the game. One could choose to dabble, trying new things as they strike the fancy of the player with the World of Warcraft account. Alternatively, by focusing points in a specific area, the player could reach high points of skill that are not other wise available, except at the expense of other possibilities.
These types of choices are some of the things that make a World of Warcraft account so popular. In the end, it probably comes down the same argument heard in many other games that between those playing the game as if it were a giant computer and those who prefer to play the game inside their heads, and use their World of Warcraft account as an aid to tell the story. It is not simple decision, and both sides have their arguments. Those players who use their World of Warcraft characters to obsessively calculate percentage chances of survival for each encounter are, in a sense, playing a very deep and complex game of chess, battling the odds of randomly spawning monsters and those who programmed them.
It is a noble task, I'm sure. But on the other side are those who simply enjoy their World of Warcraft account for the fantasy it immerses them in. They, instead, gain pleasure from the degree to which their story can be maintained and expanded.
It is a difficult to answer question which, if either of these approaches, are the best or most useful. Both have their proponents and World of Warcraft characters on both sides seem to be enjoying themselves.
Buy your world of warcraft account and learn about the skills the world of warcraft characters have! But most of all, have fun playing the game!