I played Guild Wars mostly through all the betas and events and was hooked for the time being. I eventually made a guild with a bunch of random people I met.
We did quite well for ourselves, placing in the top 50 of 2000 or so guilds. I'm not sure what guild battles are like right now, but we did over 50 battles at that guild hall map ( I don't know if they have more than one map now, forgive me).
The actual battles were quite intense and very fun.
I remember when I first played though, I thought it was some form of CTF, so our hole team ended up blitzing their base the hole round with one guy carrying the flag around screaming random shit, pretty funny at the time.
Great game nonetheless, a delightful and refreshing change over the usual mmorpg, although GW is more of an mmog than an mmorpg, game is still fun as hell.