Guild Wars 2

You can teleport 10 golems to keep doors,
You can have your 40 man team ninja back a keep without need of breaching walls You can bring 30 man up on the jumping puzzle by your self
You can pull 5 guys from a keeps wall at the same time,
You can send your clones beyond any structure to create headaches.

what’s boring with mesmer?

I would suggest Necro, played correctly and with all the bug fixes they will be getting they can really play havoc on zergs.

I’d have to agree with sticking it out as a mesmer. They have so many tools for manipulating the battlefield and buffing/debuffing.

As mentioned above, you can pull up to 5 players off of keep/tower walls with the focus. Not only that, but you can pull people off of high bridges and cliffs, sometimes to their deaths. The other night there was a large battle on the stairway and bridge just south of Askalion Hills. I pulled 3-5 people off of that stairway and to their deaths not once, not twice, but three times over the course of that battle.

There’s also feedback, which can completely shut down some siege as well as ranged defenders on keep/tower walls. Not only does it protect your mates but it also punishes your enemies, especially since it makes enemies combo confusion on themselves.

That’s not even mentioning the amount of survivability you have as a mesmer. With the right utility skills, you can completely troll the opposing server’s force into following you the wrong direction into a trap or away from an objective, and then still come out alive.

You can also spawn illusions like the berserker or warden (sometimes) up on keep/tower walls to lay down some respectable damage.

And then of course there’s portal, which has been already mentioned.