Guild Wars is a great choice, especially if you like balanced PvP.  Everyone is the same level, and teamwork is encouraged throughout the game.  If you like running solo, you can equip a full team with henchman, and 3 heroes who have templates you can adjust like your own, and micromanage their skills if you want.  As it is now, the game has been out long enough that most people wil either play with their guildies, or play H/H solo in PvE.  PvP still has a very active community and a lot of choices to fit your skill/preference. 

On-topic, you go to International districts if you want peace and quiet.  Go to AD1 and you will find crowds in most towns, especially big trade centers like Lion's Arch, Kaineng Center, and Kamadan; and ToA.  Considering the last major content release was about a year ago, this game is among the most active I've seen.

The game's been out, what, 3 months?  There are 80 levels.  Someone who can grind out that fast to high-end content should look around the house and see if their wife and kids are still there.  How about GvG siege battles?  PvP?  Every game is buggy and not equipped with all its content, in the beginning. 

You can't name an MMO that isn't, unless you have selective memory(which most in the forums seemto have).  If they waited till all bugs were fixed, they'd never release, because most aren't found even in beta release.  If they waited till all content were ready, they'd never release, because you can never satisfy everyone with what you have.  Look at LotRO.  They seemed short on content in the beginning, but added chapters as the game went on(up to 16, I believe).  It's why the mantra "never buy an MMO when it comes out" is around.  Unless you are willing to accept a little lack of polish, don't play it.

AoC also announced adding more upper-level content, so the issue is being addressed.  A game like this, graphics-heavy and complex in gameplay, takes a bit more time to write for. 

An MMO, while fantasy, allows that each character has strengths and weaknesses, and will gravitate to their strengths in their life.  If you are a computer programmer, are you also a construction worker, or a lawyer?  In most cases, no.  You could have skills to add an porch to your house, or know enough law about software copyright, but chances are you won't have a law degree or a contractor's license.  A ranger is someone good at tracking, trapping, and shooting a bow.  All their skills, even healing, relate to this.  A warrior is good at giving and taking melee damage.  Their skills are set to do this job better. 

People who can PLAY, who are beyond the card-pulling and button-mashing phase, enjoy a little realism in games.  Realism means when you grow up, you naturally fill into a certain job/role, based on innate skills/talents.  These all have strengths and weaknesses that, depending on the individual's style of gameplay, fit people better or worse.  It also adds variety to the game.  Otherwise, most people(even 30-50 year-olds) would gravitate towards one or two imbalanced templates.  What is interesting about that?