Come on, it's only ten bucks.
The roster of weapons is not as impressive as it once was, but most of the iconic weapons have returned (such as the cult favorite "Holy Hand Grenade").
The voices of the worms are as good as ever, possibly even better than ever. There is an impressive list of available dialects with which to customize your worms.
The landscapes are more limited than in some other worms games, but still very satisfying.
The physics have changed just a tiny bit, so that series veterans may have a bit of a relearning-how-to-use-weapons experience.
Other than the previously mentioned changes to the series, every other aspect of the game should be familiar to anyone who has played an old school Worms game. Worms for the Wii is pretty disappointing, and the 3-d games weren't so hot either. But, this DLC for the PS3 gets it right by getting back to the core awesomeness of it's predecessors. And this time, it's more affordable than ever. So, if you have any interest in turn based combat loaded with humor, then definitely buy this game. It's totally worth it's small price tag.