The halloween event shows pretty well that...

[Myxir]

Some minor points that immediately came to my mind with playing during the halloween event.

... (1) there can be much action and fun in the game.
Now there is much more war going on in the warzone. Fights are happening on nearly every fort (and saves as well :/)
Grinding spots are nearly empty.
Why isn't there so much action everytime? It just shows that RvR in this game is not important enough. Now people fight for stupid masks like crazy fools
I think it should be more rewarded with costumizing stuff. Giving more appeal to war could improve the gameplay in war zone a lot, as it is now during the event.
The war zone is quite dynamic at the moment, I think! Very good!

... (2) RO gameplay mechanics are not be made for such big fights. In the laaaaaaarge crowds it's impossible to select a special enemy you want to target. You just click one and spam your areas. Coordinated attacks are very very hard to perform. FPS and lag are aweful which makes it even harder.
Additonally there is the problem with sultars terror that is currently discussed in another thread. An army can be knocked for minutes if timed well.

... (3) all classes have a real meaning in the game, except hunters. I already mentioned that grinding spots are mostly empty now, so you cannot go on a decent hunt trip.
In RvR it's very hard to play a hunter successful. No useful areas to use, selective operations impossible because of the points mentioned in (2). But I think this applies to nearly all classes.

So all in all the event shows that there is quite a lot of potential in the game but due to performance and game mechanic reasons it's mostly unplayable (for me at least).