The Worms games are still around today and these two editions are where it all started. Whilst now the graphics would be considered bad the gameplay and replayablility is so good that you'll still have hours of fun.
The best thing about these games are just how good they are in co-op mode taking on one or more mates as the battles just get funnier and more intense. The excellent variety of weapons, strategies and silly in-game voices from character will stop you from getting bored.
For the price that the games currently are at it's a bargain and one of the best older games you could buy today.