Happy Wars released yesterday, although you wouldn't have known unless you were looking for it as I didn't see any ads on the dashboard for it. I actually had to use the bing feature to search for it.
But... it was well worth it. There are some big matchmaking issues, but the game is very fun and there are tons of weapons/armor to collect and upgrade. Battle is "supposed" to be 15-15, but most of my matches started at about 10-6, with the team having more players winning each time, regardless of player level. The system takes a long time to match players, and you might lose connection to the server during matchmaking. I never got booted during an actual match.
Matches are all won by destroying the opponent's totem in their home base. After 15 minutes, if no one has done that, the team controlling the most interim points is declared the winner.
And on player level, how are people level 40+ mere hours after launch, even with the advance launch for beta users? It did get old getting one-hit-killed after running 1/4 of the map to join the fight.
As best I can tell, leveling up does not effect your att/def stats. It only allows you to carry heavier gear, which in turn, allows you to get stronger.
There are 3 classes, Warrior, Mage, and Cleric. They have the strengths/weaknesses you would expect, but I find healing with the Cleric difficult with all the people running around and no easily visible health bars. Might get easier with practice. Clerics have the added duty of being the only class that can create the materials to build siege weapons.
There is a single-player mode, but missions unlock as you level up in multiplayer. This is very annoying to me, but I guess I understand why they made it this way.
I don't know how long Happy Wars will stay fresh. It is fun, and free. I certainly enjoyed my couple hours with it. To sum up, I would compare it to Castle Crashers both in terms of art style and simplistic combat, but with skirmish-style gameplay.