Guilds; for any PvP player, they make life much easier. HoH is always easier to engage in, provided you have a guild. GvG requires a guild. Organized 4v4 can be done with friends, or just about anyone (luckily). Random 4v4 is for anyone. (I am excluding pre-level 20 pvp).
Of these PvP types, HoH and GvG are the most rewarding in many ways: They provide faction points much faster and they provide ranking and fame; GvG provides a certain status among the Guild Wars community; HoH provides celestial sigils. They are both very fun, also.
So guilds are very important and convenient to any serious PvP player. I have experienced guilds in the past. Five guilds in total: My first guild was my own, when I started playing (as a beginner I just made it for fun). My second was the Forsaken Elite (a guild that fell appart a week after I joined). My third was a rebound guild formed by me and the good players from Forsaken Elite (which broke down in a day). My fourth guild was a rebound guild for myself, called the Walmart Shoppers (which I soon quit after I decided it wasn't good). My fifth, and current guild is my own; with a guild hall, and all. As a rank five player, can you guess how many members I have in my guild? Can I get a guess? TWO (2); me and a friend.
This is the point: Good players are easy to find. Good players without guilds are almost impossible to find. Good players willing to quit their guild for a serious guild are the hardest to find. You can find good players in the game, but you can't play any organized PvP with them, and you certainly can't recruit them for your guild. Players either have a guild from beta, have a guild from the start of the game, won't join your guild, or are idiots (which I don't want).
I consider myself a pro at Guild Wars. I'm not the very best; heck, just a week ago I didn't know what a spike group was. The thing about me that separates me from the rest is that I try, I think, I learn, and I spend decent time; I'm not slow, and I certainly use the best of my time. Alas, this is not enough to join or recruit good players for that GvG experience; you have to have great luck, you have to know them, you will have better luck if you were in beta, you "should have gotten with the guild when it was recruiting", you... get the point, right? It's hard.
Just today I've been spending over five hours in the HoH playing with different builds, searching for good players. The good players either tell me they don't want a guild with so few players, they want a guild that is well known or with a well known player, or they're already in a guild. I spent five hours, and didn't win one HoH; nor did I win a guild member over.
Is it this hard for everyone with a guild hall, a cape, and a ranking to get players? It seems like I have to have a good number of guild members to be able to further recruit guild members, which is sort of a loop-hole. I don't get it...
C

We go by spam recruiting in tombs/toa followed up by spam kicking if they are not up to standard which happens quite a lot. We do get ppl who are pickups when we lack someone for tombs but that is rarer.