The game is very good if you like fighting other people, aka PvP or RvR. It is difficult to get going as someone completely new to game though. If you know some people from WoW that play here (and there are thousands who have tried WoW), then that would be great if you could get hooked up to a decent guild in a decent alliance.
The basics are there are 3 realms here as compared to WoW's 2 realms.
Each realm has 15-16 classes, with many race choices which give customization to your character from the outset.
The game is fairly balanced between casters and tanks, w/ most hybrids a bit behind the curve, but still fun to play. Stealthers do okay, although most group b/c soloing can be frustrating. True archer classes are lacking a bit, but are promised upgrades soon.
Leveling casters is a bit cheaper to do for a total new person to game. you might want to consider it. There are the normal ruleset servers, and there are 3 servers that are called "classic" servers (the bossiney cluster). The Bossiney cluster may be a bit easier for you to find other new people to the game, level with and get groups, but you will be missing out on some of the context of the game including artifacts and Master Levels.
this game is more about what to do after you are Level 50, then getting to Level 50 (perhaps a bit different than WoW).
Ask some more questions, and I will try to answer them.