If you're looking for a nice, fluffy list to play with your friends at Local Friendly Gaming Store, then sure, you're good to go. However, not everything is as optimised as could be to make much sense in a competetive list.
There's nothing particularly bad with this list, a plenty of Fire Warriors, an Ethereal to support them, a decent amount of markerlights, heavy guns both armour penetration as well as anti-vehicle. However, there are a few things done just poorly.
First of all, sure, a Devilfish is a very good vehicle, but instead of the Pathfinders, I'd give it to your Fire Warriors. You want to keep your Pathfinders as far away from harm as it's possible, despite the fact that in fluff they're the one leading the way. Their main role is to provide you with support, and they can only support you when they are actually on the field, not inside a devilfish. Fire Warriors on the other hand are a good pick to unload at the control point and deal some heavy retribution from close range, with additional cover save granted by the Fish of Fury.
The composition of the Fire Warrior teams... There's nothing particularly wrong with the DS8 Turrets, they are a points effective source of some relatively heavy weaponry, however, they make your army much less mobile, bear that in mind. There is no point in bringing the drones however. First, you're gonna need a Shas'ui, and honestly, with an Ethereal in your army, you're basically wasting 10 points per squad for doing that, as you're always going to have Ld 10 anyway. Secondly, the drones are more costly than the Fire Warriors and are of little use. An additional Fire Warrior is better than a Gun Drone, with BS3 compared to BS2, even though the drone is twin-linked. Sure, usually you're going to have markerlights to take care of that, but still, it's something to bear in mind. And you're not going to use the drone's Jet Thrust ability a lot with the rest of the squad being quite static. Shield Drones are just an additional wound that might have a 50% chance of deflecting a low-AP shot. You're using a 12 pts model to save a 9 pts model and wasting two potential shots. I don't think it's worth it at all. Marker Drones are still BS5 and still more costly than a Pathfinder, so not the best choice either.
The Crisis Suit team is quite well equipped, as both Plasma Rifles and Missile Pods are a valid option, however bear in mind the range difference of the weaponry and adapt them to your tactics accordingly. The Drones are a nice bubble wrap of ablative wounds and with Target Locks you can actually shoot 4 different targets per turn. I don't think picking here Marker Drones will be the best idea, as that's still only BS3, even with the drone controller and you already have a plenty od markerlight sources and there might be a problem with the differently-ranged drones shooting the same target. It's not the worst idea either, but I just wouldn't do it.
A Pathfinder team... I don't think there's anyone walking this Earth and the others who loves the Rail Rifles more than I do, however, bringing them to the table in a competitive match is asking the opponent to beat you. Badly. S6 AP1 looks sweet when you look at it, especially with them being 30" Rapid Fire. Two shots with that weapons are a dream of most of the people who see this weapon. But just look at the points and you have to change your mind. It's 26 points per model. A Crisis Suit is cheaper than that. It is carried by a Pathfinder, who is infantry, T3, 1W and only 5+ save. Compare it again to the Crisis which is T4, 2W and 3+ Jet Pack infantry. And the only advantage over the Crisis Suit's Plasma Rifle is its range. S6 AP1 does look sweet, but then again think, what are you going to use it against? It's not the best pick against the vehicles, as with only S6 you're gonna penetrate Rhinos at 5+ rolls at BS3 (cause you don't benefit from your own markerlights). And that's when your AP1 is going to be of any use. Maybe. Other than that Plasma's AP2 is just as fine. Besides, the Rail Rifles are not gonna be much used when your markerlights might be used against the opponnents they might not be particularly efficient against or might be out of the Rail Rifle's range. All in all, you're paying 78 points for maybe 3 lucky shots. It's simply not worth it.
And as for Riptide, I think you meant an Ion Accelerator, not a Fusion Blaster, as you might bring either SMS or Fusion Blaster as your secondary weapon option. Depending on whether you expect more enemy infantry or vehicles, pick one or the other. And yes, when you're equipping your Riptide, definitely pick an Ion Accelerator as your primary weapon. Heavy Burst Cannon is just a joke.
Hope this pretty long post will help you with your first battles for the Greater Good and may the Aun support you in your campaigns!