If you've read up on lore regarding the setting and are familiar with playing on D&D themed servers you may agree with parts of these statements :
- The setting works for the good guys
- Most characters are good aligned
- Good guys win in the end
- Good guys are defensive (and boring to play)
No, this is at best an half-truth. Below is a (massacred) map of the Sword Coast showing where the setting is mostly backing your actions as a good guy :

False, most player characters are neutral aligned. The last server snapshots showed roughly 40% neutral characters, 31 % good, 29% evil.
Far from an overwhelming advantage, isn't it ? Furthermore neutral people are almost as susceptible as evil ones to screw with you, because while they don't like mean neighbors they'll also show you they're not good aligned.
In effect, and since we are playing NWN2 (where non-good PRCs and abilities are simply more powerful mechanically) you will almost always be outgunned and often outnumbered as well.
This is the simplest one. Contemplate the list of mayhem and destructions and corruption that happened on the server. Who's winning ? Bad guys, almost all the way. Play good aligned characters prepare to lose most of the time (granted, not always either).
One possible reason : good guys work double. Not only do they have to thwart their evil brethren players characters but they also can not ignore the various villains that the DMs summon from the depths of their souls (if they have any).
False, at best it is a consequence from being overworked. Being good aligned is an active duty, you go out of your way to help others, think mother Teresa, Human Rights watch and various NGOs. They're not waiting for evil doers to knock on their doors.
In the same way on this server playing a good aligned character is not being a sitting duck. Your character has ideals and he strives to spread them, wether by fighting directly other beliefs through swords or words or by teaching through examples and accomplishments. Good is not stagnant.
"Baldur's Gate is a peaceful neutral city-state ? Its laws sure could use some improvements or leniency."
"Darkhold is rebuilt ? Preach on brother, time for a crusade to annihilate them all."
Those farmers are working so hard for so little .. I should use my immense intelligence and powers to help them and craft waterways or prvoide little services for free.
"Rodents, you said ? One exterminate spell is all you need my good madam. Need anything else that my magical power can solve ?"
You can (and ideally should) be as active and, in a way, agressive as the bad guys. If you don't do anything you're neutral aligned ... at best