At this point in time Worms World Party Remastered is so glitchy at launch you would be forgiven for thinking Bethesda made it. Look at other reviews for specifics on that though, I'm just going to talk about the game itself and whether it is worth grabbing if you already have Worms Armageddon. Worms Armageddon - Pros: Cheaper of the two games, more lively fan base, various fan mods to improve performance, overall better single-player campaign Cons: single-player mode requires you to beat tutorial missions to move on, if you want to experience the game to the fullest you have to install some mods, voice editor can be really glitchy on certain computers, many players of this one tend to be more elitist then players of the other Worms games On Steam and not GOG, whether this is a pro or con depends on your feelings toward Steam Worms World Party - Pros: more varied multiplayer game modes, Wormpot livens things up even more so, multiplayer missions, voice editor works better, more pre-made content to choose from for customizing teams, single-player campaign requires no tutorials, remastered version eliminates the need for fan made performance mods, improved online, comes with a map editor Cons: As stated before the remastered version is currently unplayable, nowhere near as much mod support Pro and Con: single-player mode is incredibly hard, while it will entertain veteran Worms players newcomers will often find it more frustrating than fun A lot of Worms players would probably burn me at the stake for saying this, but I consider Worms World Party the better game thanks to additional game modes, pre-made content, and more efficient online. That said, if you already have Armageddon and enjoy that you aren't missing too much if you don't get World Party. If you have neither one and want one or the other: at this time get Armageddon, as awesome World Party is this remastered version has a lot problems. Once its working though I could not recommend it more.
Ignoring the fact that the developers are jerks and the scandal that that this game was involved in, you should really avoid this game. On paper the game sounds like a blast: a first person rougelike under the sea with multiple classes. But then you play it... It is the most generic shooter imaginable, not as bad as something like COD but this is one of the most uninspired games I've seen in a while. The Minecraft-like graphics don't help matters, sometimes its pretty but most of the time it is either ugly or distracting enough in that it ruins the game. It is incredibly easy to lose your bearings and end up losing track of everything around you, combine that with the cheap monsters and you've got a recipe for yelling at your computer screen. I don't want to enter full rant mode so let me sum up: this game has great ideas but horribly execution, hate it not just because of the controversy it spawned but because it is a bad game.