Great multiplayer, perfect controls, and simplicity bring all the elements of this game together.
The controls do what they should, and well. The D-pad moves your worm left and right, while the B button jumps forward. Tap it twice and you do a high jump backwards. There is one type of jump missing, but it's no big deal because it's unneeded. Roping works extremely well, too. The physics of the game are also spot-on. You can shoot a bazooka against or with the wind to get around objects just like you would on the PC and have it hit where you want it to. The "gravity", if you want to call it that, is the same as the PC version as well. You call from a distance, and you get hurt if it's too far up. Swinging from a rope is just as easy as the PC version as well.
There's a lot of new modes in this game. Campaign, Puzzle, 3 minigames, Fort battles, and Rope racing. All are very addicting, although you may only do rope racing with a human player...no computers, which is a downer. Most noteable is the Wifi mode, however. It's fun and addicting. You can do Ranked, Unranked, or Friend battles. In Ranked battles, you choose between Deathmatch, Race, or Fort battle. In Deathmatch mode, the weapons you're able to use are random, testing one's ability to win with anything you're given. The other two modes work like they would offline. In Unranked battles, you can choose to look for 2, 3, or 4 player battles. You can also choose from Deathmatch, Forts, or Race modes. Friend battles, as usual, require Friend Codes. The one thing I miss online is the game rooms you could choose to go in, like on Worms World Party.
Overall, I think Worms: Open Warfare 2 is a must-buy for the Nintendo DS. It's superior to any version of Worms, and it's great to see Team 17 go back to its roots with a 2D Worms game.