Hm, for Andy, any Fart app. For the rest of the general population may I suggest, Galaxy on Fire 2, Dead Space, Call of Duty Zombies and Star Wars Falcon Gunner?
http://itunes.apple.com/dk/app/neuroshima-hex/id391297152?mt=8 is bloody amazing, and there is a lite version out, so donĀ“t belive me, try it yourself. It is a universal app and a good conversion of the board game. It has a steep learning curve, but actually reading some of the online PDFs for the boardgame can help you there, if you feel lost with a few details.
Favorites: WWF (of course) Top 5 others: -Nova 2 -Dinosmash Online -Trenches -MC2: BP -COD: WAW: Z Starfront is coming soon, and that should definitely qualify as an epic online game with its multiplayer mode. It's Gameloft's upcoming rts based on StarCraft.
Pocket legends, even the psp or ds (outside possibly phantasy star portable 2) have a mmorpg on this scale.