At E3 2014, when the Splatoon trailer launched, I literally said aloud, "What a cool Mini Game." I made a few comments that would now appear extremely cliche regarding 90s nostalgia as well.
It then continued to receive the most amount of air time and press at E3, and for an entire year to come.
I knew early on, Nintendo is pressing a new franchise, I will at least try it out.
The game launched 3 days before I departed for an international trip. I had known the mechanics from the timed trials of the live demos several weekends prior, but I had no idea how much I would crave the game in my time abroad.
In that time, a lot of the issues I had with the game were fixed- and with continued updates to make competitions more and more elaborate, unique, balanced, and rewarding, I found out the reason it was getting so much hype:
This is a game that requires online play, no question. The one player is fun, an evident tertiary goal.
Nintendo had to build a user fanbase for the game, enough to make the competition and number of competitors continue to grow and play.
Not only has Nintendo never had to rely on an online gaming community, I cannot say for sure that any other company of the genre has had to build up an install base quite as slowly-- every Call of Duty and Halo has a decade of loyal fanbase ready to turn on and play at an moment, Splatoon had to build a full audience from scratch.
The game could NOT have succeeded if Nintendo did not push for players to constantly be online.
For Splatoon, I truly commend Nintendo's efforts; not only is the game such a revolutionary in changing the gratification of successfully interlocking a target and ray (this is the basic psychological reward in the shooting genre), but Nintendo really, for once, succeeded in pushing its online play* and an entirely new IP.
The game is simply well balanced; the movement ease of the squid form inspires painting to be a crucial mechanic even without kills, the kills (splats) are neither the sloe important task nor something to be overlooked, one can attempt to be the MVP but it is very helpful to work as a team, each weapon provides different uses for each different game.
All around, it is very well balanced- which makes it very rewarding gameplay.
*Online play is blowing up with Nintendo, finally, and thank goodness. Mario Kart, Smash Bros, Splatoon, Mario Maker, and even games like Triforce Heroes now-- the fact that Nintendo is handling all this in a well constructed manner, is any fans best dream for the company.
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Also, I think Xenoblade is getting a lot of attention.