The best worms yet. Simple As.
If you've ever experienced the previous Worms games (Excluding the '3D' versions) you may know what the expect from OW2, the game is a strategy game where you take turns after the other player, whether he be CPU or a friend on Wi-Fi, and you basically destroy the other teams worms. You can use everything from Bazookas and shotguns, to Holy grenades and flying sheep... yes, it's literally a flying sheep. You also have other useful tools such as Ninja ropes that can get you to certain places or girders that can provide cover or be used as bridges.
The single player is actually very challenging. The CPU may take time to plot his next attack, but it can certainly do some damage when it needs to. However, you dont just have to do war, you can have a game of Rope Race or Forts or even do some challenging puzzles. It's enough to keep you busy. Also, to make sure your not too bored and you get your fair share in customisation, Worms: OW2 allows you to customise almost anything, such as your Schemes, Maps, Worms and even your very own flag! The flag can also be seen online.
Speaking of Online play. This is possibly a bad downfall. Most people are playing Medal Of Honor: Heroes on their PSPs, but for some reason, not many play this. You'll find the odd couple of servers here and there, but not as half as much as youll find on MOH.
If your a hardcore fan of the Worms series, this should be fine. If not, this is still a great way to start off.