The good old worms you know corrupted by bad UI or as some like to call it consolitis
-Bad UI
-Useless chat system
-Broken Voice chat
-Lack of graphic and visual settings
-Bad server browser
-Game constanlty makes you wait in multiplayer in every turn Waiting for other players....
-If you have played worms before the new ninja rope system will be annoying for you
I haven't confirmed it but some say this is just the handheld version of worms released in 2006-2007 and ported to pc with a few tweaks.
My opinion: Stick to playing old worms until this game gets fixed a little by a few patches. Not worth 20$ as it is.