Well, ok - we've all been here before, and I know i'm going to get flamed for this - and its not a criticism of clan tactics, but of PvP strategy in general. I've only recently started PvPing again, and having been away a while, most of my PvP was done before the Grace period was implemented. Both times I've been in 2ho, same thing happened - I received a guild summons, indicating that several high level clanners are in control of 2ho... so after buffing, me and some others zone in... its empty.
We check the bunkers, and find a number of them sitting inside, so, we pull out and wait half way between bunkers and grid... and then Frylii comes out, waits a few secs, and gets a debuff off on me, and then zones. So, I wait, and after a while, she comes out and debuffs me again. So I wait, and she comes out and... well you get the picture. The only time that Frylii or anyone else attempted to attack anyone was when a guild mate came a bit too close to bunker, and she tried to kill him. I alphaed her, she debuffed me and zoned. Roots don't work properly anyway either. Only thing interesting that happened was when we got bored and started to grid out and found 20 or so clanners in grid about to move in... so we went back to 2ho, faught them openly, and slaughtered them all... people in bunker didn't try to help.
Day 2... a guildmember aks for support because he is under attack by a number of high level clanners... we buff up, and zone in... I kill one who obviously wasn't paying attention, and then me and 4-5 other omni face off Abid, Marshrike, Hunter06, Odeen and a few others around bunkers. Abid comes out, debuffs me, zones, and repeat. We were probably fairly evenly matched... it might have been interesting to fight openly, but the only attempt was when 2 of them alphaed while i was divested and plundered, so I decided to zone into a bunker too. I healed, and rejoined the other omni. After a while I got bored and left. And so on.
Unfortunately, this strategy of hugging grace doesn't really achieve anything, you debuff one person at a time in grace, so there is no way we can stand and wait for you and have to zone/pull back until the debuffs wear off. So every now and then, someone sticks their head out to see if anyone is there, and then runs back in. So far, I've only seen clanners use this strategy, and wouldn't do it myself... why? Cause its boring, takes forever and nothing happens. Every occassion this has happened, the result was the same - Omni got bored and left... I assume that clanners came out after, planted a Clan flag in 2ho, killed a few guards, then got bored too.
Ultimately, Grace was never intended to be used in this way, and in those terms this strategy is an exploit. The first main solution would be to make it impossible for someone in combat in PvP to zone (just like use of the grid) or maybe the zone block should only be there if they have attacked (would avoid people being attacked en-route to mission, etc. becoming stuck) but I understand this may be too difficult to code. Another option - although it by no means solves the problem - is to prevent people in Grace from attacking, and giving attacker a timer for target's grace. Well, people's thoughts on this would be useful, despite the inevitability of this becoming a flame. Whatever. I don't have anything against you clanners personally... I just think that this strategy sucks for all concerned, but then maybe that's just me, and you guys are having an awesome time sitting in that bunker