I don't know if any of you have heard of Guild Wars 2, but I just played the beta a bunch over the weekend (release is about a month away).
Basically, it's an MMO without any subscription fees, so you just purchase it once and that's all the money you have to spend on it (unlike WoW, etc.)
I won't go into all the classes you can play as, suffice it to say I played as an engineer up to level 20 and it was a lot of fun.
However, I do want to mention the World vs World game mode because it was insanely fun. Each server is its own faction, and there will always be 3 servers battling it out over an enormous map full of different capture points. The battles in WvW can range anywhere from tiny 8-on-8 skirmishes to all-out sieges that can have 50+ players per faction battling it out for a keep.
I am not going to go into much detail since there is A LOT to it and you'd be better off watching a
youtube video explaining it. Instead, I'll just recount my experience.
Each faction gets a spawn point on the map, which roughly corresponds to the points on a triangle. There are capture points littered throughout the map in key locations, and they vary from supply camps (these produce supply which is used to repair walls, purchase upgrades and build siege equipment) to towers to keeps. Supply camps don't offer much in the way of defense, and are easily turned over by a small band of players.
When I entered the map, I went to the tower that was under attack by the two other factions. One faction started building a few trebuchets and ballistae to batter down the tower's walls since their frontal assaults failed numerous times. I tried to get a small group of players together to flank their siege equipment and hopefully destroy it. Instead, we ran into a group of enemies trying to flank our tower, but after we destroyed them, we rushed to their siege equipment and tried to destroy as much of it as we could.
This same group of players and I basically went on assaults behind enemy lines to cut off their supply routes and force the enemy to retreat from the front lines to tend to business at home.
Eventually, we joined up with the main army which was trying to assault a keep, which is basically an ultra-fortified version of a tower. We did not have much luck until we finally got some catapults right up against their wall which didn't have many defenses and after a good 10-minute battering, the walls were finally down (this was after trying again and again to rush their front gate only to fail each time). Once inside the keep's outer walls, we cleared out the few defenders cut between the inner and outer walls and another 10 minutes of battering the inner walls finally saw us take the keep. All in all, it probably took our faction at least 3 hours of besieging the damn keep to claim it. Once a tower/keep is in your possession, you can spend money on upgrades to increase its defenses (burning oil, cannons).
Sorry for the long post, but I had such a great time playing it and I thought some of you might be interested in this type of game. My only complaint is that there can be a lot of running around because when you die, you can only spawn back in your main base or another keep that you capture.