Wow, so much butthurt in this thread.
Splatoon was playable at E3 last year, and likely won't release until late May (MK8 slot), so is in no way being rushed. The one gamemode (in online 4v4) is probably to make sure that people don't struggle to find a match. Remember this is a brand new IP. At this point in time it could be a MK8/Smash scale hit or a W101 flop, or probably somewhere in between.
If its popular enough then Nintendo will probably do a DLC map pack, and an update to add game modes. But at this point in time they want the game to be as good as possible, and if it's impossible to get into a game of your chosen mode then your enjoyment of the game overall is going to suffer.







