I just want to post to throw in my support for PvP in FFXIV. I spend most of my time now in-game in Seal Rock and I thoroughly enjoy it. PvP as a whole does need work (but so does PvE and everything else really, an MMO is a constantly improving machine), but for the most part I find it well done. Seal Rock in particular is the most tactical PvP scenario I think I've ever seen. Sure the RNG can sometimes ruin you, but with three large teams pitted against each other it feels more like a war; Party composition and RNG aren't half as important as the strategy that your grand company chooses to use during the match and that is what I think large scale PvP should be.
When to attack, when to ignore a node and let the other teams fight for it, when to gang up on a team, when to brace yourself because you know you're about to be ganged up on, when to run the long way and perform a sneak attack...these are always different in every match and that is amazing fun. Its something that PvE cannot offer.