I guess it's just me.
Seeing as I've played almost every single of these games and I have tried this one, it's not really that much of a difference between this and the old ones, besides new level features. Such as in-map fluids in which you can drown other worms by destroying terrain.
It has almost if not all classic weapons and it's rethought in a pretty good manner.
It's gone back almost to the former glory of Worms if you ask me, I'm thinking Worms Armageddon.