Hmm, So I wanna say that due to a few friends, Halo 2, and MLG, that I absolutely detest FPS games, with a passion, and Surprise! As a result, I'm mediocre at best at them.
But Splatoon.. Man, They got things right; on the next level.
Krak-On Roller Main. I'm OCD as F***, so being able to perfectly coat the floors or pick up behind 'spray-and-pray' kids, makes this weapon's way of covering Turf amazing; although that applied to the Ink Roller as well.
Also, The Melee Swing is not only perfect for me as I can judge distance pretty well and the shotgun comparison is soo accurate. It's easy and doesn't require practically any aim overall to do what it do.
Beacon, I hate for two reasons:
1. Unless Inkstriking, your team won't ever know a beacon is out there, or look at the map, so it's a polite waste of Ink (although, sneaky places to place it like on top a box or tiptop of a half pipe make it not explode immediately after you throw it down at least lol.)
2. Almost 90% of the time as I grind Gear up, I shake my head when Ink Saver Sub and Especially Bomb Range Up are that ability you worked so hard for that is now wasting a spot.
The Kraken. Man, this thing is stupid.
Of course I mean Stupid in a way of saying Obnoxiously Great. My goal in most game modes is to immediately build up Krakeb, then go do as much in enemy territoy as i can; as long as it's not a Charger far away, then almost always someone will try to stop you, and that's when you hit the switch and either kill their entire team, or scare them and use it to get as much ground covered and as far into roll-able territory as you can. This thing Is my Tomoe. Always protecting me, Killing with Spins and ridiculous speed/strength.
My Set up is having (all main abilities) Speacial Charge, Special Duration Up, and Special Saver. Kraken is fast, lasts a long time, and incase they got you before you moticed, it saves enough to not take forever to get it again. Sub abilities that matter imo are (any of above), Swim Speed, Run Speed, Ink Recovery, Ink Saver Main, and Defense.
I hope this was at all helpful, again I'm no FPS player, but I make this thing do work for me, and constantly push it's potential and tricks. Don't focus on the Kill Count, Roll and the kills will come to you~