Started off Alliance. Full of rude, crude, sexist jerks and naked toons miming sexual acts against one another. Rolled Horde. Less full of rude crude sexist jerks, and a little more discretion. (Hey, whisper! What a wonderful way to share PRIVATE RP).
I actually think there's more solidarity and connection Horde-side because Alliance folk? They just want to be heroes. They're a one-man army in their minds. Horde are the outcast 'monsters' who work together because the rest of the world refuses to accept them. They have to fight the REAL monsters and the people who'd label them as such. Stories are more compelling, players are more welcoming, cities are more badass. There's just no reason for me to go Alliance ever.
I did roll Worgen just to see what it was all about, and managed to get disgusted enough with the Ally players in the starting area to quit and go back to my undead priest. Lesson learned. Again.