As a big Worms fan, this can be summarised in easily - a real let down!
Armageddon is in my opinion the best Worms game. I never expected this to be as good as Armageddon. I knew from the screenshots and videos the graphics would not shine, and there were not all that many weapons, but I didn't care about that. All I wanted was a portable Worms game I could play both alone and with friends, and enjoy. I didn't get this.
There were too many glitches, far too many problems with the game. Worms fell through the ground on occasion to their death. Pixels of land, invisible to see (and sometimes nothing at all) stopped me using the ninja rope effectively. When I changed the grave stone in the options, it did not actually change it in the game.
All this, along with the fact that single player was far too short and boring left me dissapointed to say the least. And there is no multiplayer multi cart game - and you cannot play multi player on multiple DS consoles playing as your created teams!
I changed my game thinking (and hoping) the problems would be a fault with my game card, but the new one was just the same.
After owning Worms: Open Warfare for my DS for 2 weeks exactly, I had had enough, took it back, and changed it for Animal Crossing, which after 4 days I am glad I did.
So to summarise, even though I didn't expect the best Worms game, I didn't even get a good Worms game that I could enjoy. The glitches sucked any fun from the gameplay, and made me get rid of the game after only 2 weeks.