Don't listen to him, he's just salty.....
the server is pretty balanced as far as faction population goes.
The raiding on both are decent, although Ally side tends to have more hard-core end game guilds, as well as more dominate PvP guilds, and Horde has more causal guilds for both. I can't speak for the Ally side as far as geographic location goes, but It's my opinion, that most stateside players go horde, or play both, met a lot of those....
As far as WG goes, both sides tend to have WG pretty even.... the player above just wants to control it 24-7, which is just not gonna happen. So don't let that deter you, there is much fun to be had.
Lord I can't really speak to either, as I will never play a 1x server again. I did my share of that in retail. I will say it sits around 6-6.5k population at peek, and 2-3k off hours.
In any case, which ever faction you choose, server you choose, and class you Choose, welcome to the server!
You'll have a lot of fun here for sure.