Lucky you with Worms United. I wish so much to get a copy of that game.
Anyway, I have the "Worms Battle Pack" which have Worms 2, Worms Armageddon and Worms World Party all-in-one pack. Worms Armageddon has the best missions in my humble opinion and Worms World Party has some nice features.
Banana Bomb is indeed an extremely powerful weapon, but it's nothing compared to the "Armageddon" with "Double Damage" on!