I myself love the flagging quests and pre-raid and raid that is Titan's Forge.
Actually the quests themselves are decent XP. Not top tier for their level but not slouches either.
In my opinion the reason why most people do not run these quests and raids...
- Getting to the quests in the explorer area - with the map working the way it does it is difficult to keep track of other members as you run through and easy to lose other party members
- Flagging is really a one time thing. Once you get the two pieces all you really have to do is get it repaired and you can be off to the raid
- The explorer area is not raid group friendly - either you have to get out there through the area and then join the raid group or need to take advantage of greater teleport which must be done from a non-public area
- The Loot has easier to achieve elsewhere options. As much as I like my chattering ring dodge options are much more available
- A large part of the population has moved to Epic
In all honesty the pre-raid is nearly as easy to coordinate as VoN5. Assign people their color(s) and it can work out.
However, I wouldn't mind a change to the final Titan fight that would help reduce failures because he wasn't knocked down enough times by pillars/hit by laser, such as once all pillars are down the Titan's DR/Immunities are based on how many times it was successfully hit. The other problem with the final raid part is it is mostly a 3 person raid (Laser, pillar and buns) and the rest basically pike for 90% of it. Giving the other 9 characters something to do that could also help defeat the titan would be a good change to this raid as well.