Well, for all it's worth, here's my preferred classes at least ((edit: and I ended up writing too much pointless crap after it));
Lorewise:
1. Warlock
2. Death Knight
3. Mage
4. (Shadow) Priest (Other priests do not interest me...unless they are twisted in an interesting way

)
5. Warrior
6. Rogue
7. Shaman (Only orc and troll shamans though...

)
8. Hunter
9. Paladin (Blood elf paladins were fine up until Sunwell Plateau...since then they've been very boring

)
10. Druid (I just find them annoying

)
Gameplaywise:
1. (Fire) Mage
2. Warlock
3. Rogue
4. Paladin
5. Warrior
6. Death Knight
7. Priest
^--some of the ones above came very close, as they're all very fun--
--the rest aren't much fun for me--v
8. Shaman
9. Hunter
10. Druid
My main is...or was - as I haven't played WoW since December - a male blood elf destruction warlock. On an rp server, not into playing on non-rp servers anymore...even though I suck at rp and am very nervous when engaged in it

Not a raider really, I was more of a casual player...I did raid from time to time, but it would be old raids with outdated - but very great-looking - drops.
Really, I don't think I could handle the pressure of being in a raiding guild...the other people in it could be unforgiving, or intimidating. And I make stupid mistakes all the time...like I'm in the middle of the battle and suddenly I zone out and start thinking about something else for a while...
And someone suggested the first character one makes would be of importance - so I'll say what's mine (though I bet no one's interested).
My first character ever, in vanilla WoW, was a female human mage. And I messed up her talents, didn't get I was supposed to specialize in one tree

I only leveled her up to 21 or something.
Well I made a female human mage because at that time, I had imagined - and written about, just a little - a fantasy world of mine, and its main character was this somewhat...amoral, "evil"-ish mage woman who had grey hair. I would not admit it at the time, but I pretty much made her everything I wanted to be back then. So my first character in WoW was this character recreated within the game. I did not play much back then, and I did not have that many characters due to that...and because I shared the account with my cousin and brother. Another character I remember making in those early days was a male gnome warlock, whom I had pretty much made because there had been a gnome in a book I had just read. I was very new to fantasy at the time. I only leveled him up to 10 or 11.
Nowadays I find both of those characters very, very, very - BORING
At a later time, when TBC came, I made the first character I actually played on more. He was a male blood elf fire mage, and he was loads of fun to play, especially at endgame - no, I did not raid, at all, but I loved the heroic instances. The aoe spells I loved most of all! And there are even more of them nowadays, but I haven't managed to level a mage up that high.
I lost this fire mage because he had been in my cousin's account and he suddenly demanded that I play on his account no more and I was really sad over it

He had kind of...done the same thing to my brother with a warrior he had leveled up to 60-somethings.
Now, when I played last year, I was pretty much an altoholic. I would make new characters constantly...Damn there's not nowhere enough space for characters on one server...and it's not increasing despite introducing new races and race/class combinations

I would make a new character play him for a time, then get bored and make another, then perhaps go back to playing that other one, then make another one, and another one, then maybe play with an older one, maybe delete one old character to get more space for new ones...Sometimes I'd have to delete characters I'd like to keep because they were interesting, but the new idea for a character seemed even more interesting...Gah, Blizzard should introduce a feature to buy more space for characters for a server of choice.
I would surely buy that once I'd get back to playing WoW...and I surely will because looking at my brother play the beta has been goddamn tempting...it looks like so much fun

but damn it's expensive. All the new race/class combinations! Ones that I'd surely love to make - a violent, psycho male blood elf fury warrior, a very old but twisted night elf arcane mage, and then, a hunter...who would be this cranky old man! It could be any one of the three - undead, human or worgen. They all would work perfectly. Dwarf warlock? That could be interesting.
Eh, in general I prefer the Horde, by far, even though the above might have you think otherwise. They are way more sympathetic. The alliance races are very boring compared to the Horde ones...well, I don't like taurens...they're quite boring, but make for some good cliff-jumping inside jokes...and goblins? They're disgusting, absolutely despicable boring businessmen...expect they're not that boring, thanks to some of their inventions being way cool

That goblin starting city, the quests, they are just fun. I probably won't really be rolling goblins, but goblin cities seem like loads of fun to rp in. And they ruined the beautiful land of Aszhara.
...why the hell am I writing so much...much of this isn't even relevant...
No one wants to read something this long and irrelevant.
Ehm...some people mentioned D&D alignments. I pretty much prefer Chaotic Neutral, but others I like are True Neutral, Neutral Evil and Chaotic Evil.
But - I have a spot for Good-aligned orcs! They're goddamn sympathetic!
I've played several other MMORPG's, never managed to really get into them though. I generally start with an attractive male spellcaster, if possible. Often it is not. If it's not, I go for a sexy female warrior or rogue, or some similar class in the game. What my character looks like matters a lot to me nowadays...if a game has very limited customization options, I most likely won't much like it.
¿Anyone interested in typing the WoW races like a real racist
? 
Should be interesting, though I'm not a fan of any race in particular...Mebbe the forsaken are the most interesting in general. They tend to have more interesting inviduals than the others.
Sorry for this juvenile rambling, but I can't bring myself to delete this stuff...