Hard to find any RPG that's better.
There are six different classes. Necromancer, ranger, warrior, monk, mesmer, and elementalist. You can have one as a primary skill, and another as a secondary. Your secondary can be changed once you get deep into the game, and can be changed to any of the professions, at any time, after completing a quest for each.
Each class has around 50-75 skills (didn't count myself, I was too busy playing). There are also primary quests, and side quests. Primary quests advance you in the game, opening up new cities and quests. Side quests give you experience, items, money, and skills. The max level is 20, but even with this low value it still takes awhile to get to. Once you get to 20, you probably still haven't finished the game, and you can do Player vs. Player battles. You can also join guilds at any time, each with their own cape, and possibly even a guild hall. Guilds can also take place in Guild vs. Guild battles. There is also a highscores ladder that ranks the top 500 guilds.
This is a must buy for anyone who plays MMORPGs. It's only around $40 to buy the game, and it's free from there on out.