Pros
-Decent graphics at high (If you're a total graphics *****, you'll think they suck)
-Good gameplay
-LOTS of content
-Expansion packs come out every so often. (There's WoW, The burning crusade, and Wrath of the Lich King.
-Good storyline. (It actually involves you in the storyline.
-Very good PvE
-If you have lots of friends, this game can be VERY fun.
-Read above.
-Good PvP Modes. Warsong Gulch = Capture the flag, Arathi Basin = Capture certain points on the map and defend them. Eye of the storm = Warsong gulch, AV, and AB put together. (I'm going to explain alterac valley in a bit)
-Different races
-Lots of items
-Horde and Alliance. Horde usually wins in PvP
Now, horde isn't evil, and alliance isn't evil. They're just fighting for their beliefs.
-Lots of mounts
-WASD. You can choose to point and click too if you want in the options.
Now, there is a battle ground called alterac valley. The main objective is to 1. Drain the other forces reinforcements by burning down their towers, and capturing their bunkers which stops reinforcement flow. You can also kill the other faction.
2. You can kill Lieutenants and that drains a LOT of the other forces reinforcements.
3. There are several captains/Lieutenants and etc. You can also kill the General, which pretty much what AV revolves around. You can't just charge in the first 30 seconds of the game on your mount and attempt and kill the general. You got to be TOGETHER or you don't win. You have to make your way slowly, capture graveyards so you can respawn there, and etc. It takes over 25+ people to take him down. He also has a Lieutenant (2 of them I think) standing with him.
4. oh, and, It's 40 vs 40.
5. You can do stuff like, call bombing runs, summon extra mobs, reinforce your own NPC Soldiers to make them more powerful, etc.
6. Now each faction has a boss mob of their own. You can summon them by going to your own NPC and giving them blood, You obtain blood by killing the other faction and looting their corpse. Once the boss mob is summoned, it's nearly unstoppable.
Cons
-WoW has it's own share of immature fags and trolls
-Err, I can't really think of anything else.
I think WoW is the best P2P game out there, and it's better than all F2P games I can think of. All the games I played before WoW, I quit them after playing for a couple days. But I've been playing WoW for a long time now and it's still fun.