This should game should not be compared to WoW. WoW has been out for YEARS, and this has been out for MONTHS. Was WoW totally awesome and bug free a few months after release? (no)
Anyway, there are eight different classes, all with different core story lines. Then there's quest lines that everyone shares. Personally I play all eight classes at once, I just play what strikes my fancy that day.
Each class graduates to an advance class at level 10, usually a choice between outright DPS, or Heal/Tank class. Each class on the Imperial side has a similar class on the Republic side, but they are different enough to not feel like carbon copies.
Bounty Hunter/Trooper- Heavy duty ranged DPS, tank or healer Sith Warrior/Jedi Knight- heavy Duty melee DPS or tank Sith Inquistor/Jedi Consular- ranged DPS, tank or healer Imperial Agent/Smuggler- ranged DPS, rogue type DPS, or heals
There is also a dark side/light side system that has nothing to do with your faction. You can have a Sith Warrior following the light side or a Dark side Jedi knight if you so choose. It's all about how you handle decisions. Let the poor hungry kids keep what they stole from the rich guy or punish them? Kill people for information, or talk them into helping you? Help someone because it's right, or because you make them pay you? Thinkgs like that.
All classes get different companions that serve different roles (healer, tank, ranged/melee, etc...) and companions you aren't using at the time can go do missions for you that get you supplies, money, etc.
There are tons of crafting opportunities. Make your own armor, weapons, modifiers for gear, med packs, equipment, speeders, ship parts etc.
Speaking of ships, you get one after you finish your first part of the storyline (around 12-16 depending on if you work on other quests as well). You travel with it, do space missions that are rails based attacks and it is also your personal "inn" to get rested XP.
A legacy system is used by all your characters on each server. No matter what faction, each character gains points to unlock handy things that benefit all characters (vender droids and mailboxes in your ship, buffs, etc.
They are always actively trying to make it better and it has come a long way in a short time. They are very open to suggestions, and even encourage them in a forum that they answer on a regular basis. They have big plans for the future.
There's a free trial out there, get it and make your own decision.
