I'm pretty sure most of us remember the Worms games from our childhood and that should be enough of a reason to re-start playing an oldie. Not only that it brings back memories from what feels like ages ago, but more importantly, it makes new ones aswell. Childhood memories are previous, regardless if they have been good or bad, they matter, and for that reason you should try the new and improved versions of those old games.
In my opinion, this game is the perfect evolution of the older Worms games, simply because it improved graphics and movement, but didn't go all the way to the 3D trend. I think 3D should be left for complex games of other genres, not this type. The best about this game is that the idea is simple and to the point, which is why Worms Reloaded is one of the most perfect editions.
I think you should try it, especially that it's not that short and you won't get bored of it, not need to say goodbye to it too soon. You can play campaign mode, casual with friends or online matches with other people. There's also additional challenges and things like that.
The price is fair, and it has plenty of achievements that will keep you busy.
All in all, what more reasons do you need? The game is worth it, so buy it and get busy with it.