Playing on the US realms, I have to disagree. Started playing 20s again relatively recently, but due to work only play during early morning hours, and from what I have seen, the Horde win a large majority of the time.
You can disagree all you like but until someone produces actual numbers from a decent sized sample with minimized variables (as I have) then its just guesswork and "sure feels like Im losing a lot"
Which is fair! I feel like I lose a lot more than I (apparently) actually do. 80% win rate? The fuck? If you asked me to guess it, I'd have said that over the past year my win rate was in the low 60s. A lot of twinks (especially those who complain about faction imbalance) have win rates in the 70s or high 60s. So it tracks that theyd think theyre only winning about 45%-55%. That'd make anyone grouchy.
Perception plays a huge role here. Losses sting way more because (hopefully) you arent getting steamrolled too bad. So you're working your ass off to still lose an AB 1200-1500. So it hurts. But winning an AB 1500-1200? *yawn* no way that game was memorable to you. Que back up, open your BG box, grouch about not getting a MOH, curbstomp another group of levelers in temple. Wash, rinse, repeat.
It's also time of day and time of week. I wont draw any grand conclusions about this faction does this or that faction does that, but its pretty well established over multiple xpacs that as the days and week passes, different factions experience different populations of twinks. It's easy to say that horde are a bunch of degenerates (they are) who stay up till 4am farming GYs after they get off work at Subway but thats just as true of a bunch of alliance twinks.
At "prime time" it sure does *feel* like horde run a bunch more hunter stacked premades. And maybe they do, maybe they dont (ive certainly looked at ally rosters and said "we're the baddies this game" enough times). But apparently its not affecting win rates too much. I've seen some of these hunters chat about their win rates and theyre in the 70s. Which is not far out of the norm for any given twink.
The only conclusion I can draw is that being a twink is far more predictive of your win rate than what faction you twink on. Seems like youre gonna be sitting at a pretty solidly positive win percent no matter what you do.