Title asks it all. TIA.

Get the latest beta updates, then once you've played a game look in the folder where you installed worms Armageddon.
The go to User/Games and double-click on of the games there. Ta da! Your game will play back to you in replay mode.

That's practically awesome, thanks a lot!

Also right click on a .wagame replay and have a look at all the features in the context menu.