#1 controls are a must to get spot on...
#2 consider your competition... 360 might be the toughest...
#3 How about making the game free with one map, one multiplayer mode, one skin and just one pistol to get loads of people to play and try your game. (if it's only multiplayer, the idea is to have a large userbase...maybe have an introductory single player level that showcases what else there is in the game (other weapons, skins....) like an academy introductory level?)
-> then sell the main game pack ( all multiplayer modes (yes all otherwise some will be unpopulated) + 4-5 maps + weapons + skins + classes: Medic, Footman, Engeneer) $10
-> sell a story mode pack, depending on length you may make it an other $10 (you can even make episodes, but beware, there needs to be value for the price or people won't follow past the first one)
-> sell specialized class packs ( Sniper, demolition, heavy asault) $5
-> sell a mappack $5
-> get Mii support and make a killing amout of $$ (well if Nint ever agrees to get the Miis shooting at each other... you already shoot at them in Wii play though)
(let the "demo" players be on the same games as the main game players so that if the communoty is soso in the main game maps, the buyers always have the possibility to play against the demo players (who have only a gun and will be easy to kill, thus still giving the player an impression of power and fun).
#4 give a free update like a new map after a month to the main game pack owners, will bring back the ones that left the game on standby.
I'm a Wii owner and i'd try that game and probably buy the multiplayer if the controls are good and community large. Heck for $10 i'd even be glad to play just the cannon fodder demo players.
Episodes type of releases seem to work, and it lets you reduce your loss in case of failure as well as streamline income.
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