Glaives have 3x the DPS of the Demo's.
If you can protect them, you will get into the keep first in every game.
First side in, wins 95% of the time.

Almost every game, the horde send 25+ to Workshop.
It is rather rare that an equal number of alliance can kill horde.
I've seen the alliance take WS once, on the initial push; horde went docks with 30ish we went WS with 30ish, they still won.
Most won't go WS, even if everyone that talks in BG chat say to go there.
So the alliance basically backs down from pvp, in a battleground... and takes the targets the horde want less.

Demos/Sieges have rarely one-shot my team, with 3.3k res and fully buffed including feasts.. they're definitely far more durable than Glaives.
The whole vehicle mechanic is Warcraft is stupid; I don't want to play Tanks, Helicopters and Airplanes, or Knights (ToC)... I want to play DKs, Druids, whatever.

I suppose most alliance, at least on my server/battlegroup look at the game from a PvE point of view -- players vs bosses, not from a player vs player point of view.
At least it seems that way.



Combined play... this weekend.
I'm 13 Wins, 39 Losses in IoC... with 3.3k res toons.
Vehicles absolutely rape my team in IoC, might as well be naked level 12's... they can down my whole group in 1-2 seconds and it takes 20 seconds for me to down a Demo.

Conversely, while I lost probably 80% of AV's while gearing up...
I'm winning 2 in 3, now that I'm geared.