Guild wars is already 'fun' in many ways, but there are a few frustrating aspects that I would love to see ironed out to make the experience even more enjoyable.
1) Henchmen commands. Right now, you can command them to attack and that is all. 2 extra squad based commands would make using henchmen much less frustrating.
1a) Come here. - Henchmen stop what they are doing and attempt to return to your side, employing defensive/healing skills if need be. This would switch the henchmen into 'passive mode' where they do not attack back when attacked, and they would stay in this mode until given another order or designated target.
1b) Guard here - Henchmen stop where they are and do not move until given another order. They will aggresively defend themselves if attacked and once the threat is removed, return to guard mode.
2) A 'looking for group' interface. Right now I use henchmen as much as possible, simply because forming groups is a pain in the *** using the in-game tools. It's an online game and we should be encouraged to group with each other and form friendships and alliances, but the grouping system is awkward and frustrating. A simple 'looking for group' interface where you can list yourself as LFG (complete with language flags for your spoken languages) and that leaders can navigate and select to whisper and/or invite, would make the whole process much faster and less stressful.
3) A better trading system. Right now trading is far too time consuming. I can spend hours travelling from area to area, district to district peddling my wares, or I can simply trash the items, go out 'hunting' for the same amount of time and make more money gathering items to sell to NPC merchants. Player trading encourages player interaction and is a benefit to this kind of social online game. I have 2 suggestions, one as a 'quick fix' and a second as a longer term adjustment.
3a) Quick Fix - Remove the trade chat channel, add a marketplace area to Ascalon (Ascalon Market) where people who want to buy and/or sell know to go to for trading, which can be done via the local chat channel in that area. If the chat spam is too high, then make chat channels for item types (armor, weapons, upgrades, runes, materials/dye) and allow filtering by type.
3b) Long Term Fix - Some kind of fully supported merchant system. Possibilities include, allowing players to place items on sale and go into AFK merchant mode, EQ-style. Allow players to place items on sale with a minimum price and others to place bids with automatic wins, FFXI-style. Allow players to place items on sale with a time duration and bidding system, ebay-style. There are plenty of other options too.
4) More vault item storage. With only a single PvE character, the 20 vault slots simply isn't enough! I hate to think how people who play 3 or 4 characters handle it. I have been forced to use one of my PvE character slots as a 'bank mule' for storing vault overflow. Right now my vault has: 12 stacks of materials, 6 stacks of dye, gwen's thread and broken flute... bingo, all 20 slots filled up, so where do I keep items I want to trade, future upgrades, spare runes and so on? 20 slots vault storage for 4 characters just doesn't cut it.
5) A PvP spectator mode. OK, I'll admit it, I added this to make the list a round 5. I know that it is already on the list of future additions, but as a PvE player who is, quite frankly, wary and scared of PvP, I would love the ability to check it out 'safely' and see how it works by spectating on games, plus I'm pretty sure it would be great for GvG, to enable your guildmates to watch your matches. I want to add a 'hell yeah' to the addition of this feature.