armageddon is good. Dunno about open warfare. Worms 2 had a lot of good customization options, but it's a bit aged now so I have my doubts it will work on vista. W:A works perfectly with the latest graphics drivers as long as you have the latest beta update for it from
http://wa.team17.com/main.html?page=supp&area=upda
That's 3.6.28.0 atm. Bit of a confusing page that one.