Prompto in reality is actually pretty shitty at combat, that's why he jumps around and rolls on the ground, it's because he's trying to look cool over actually being effective. Regardless, Prompto is better at guns as he clearly has a larger range of weapons and abilities surrounding them. As for your Tidus comparison, that's a poor comparison as Tidus could easily hit just as much as Auron once you give him more Strength. For example, Wakka is great at flying enemies, but that's just because he has a long-range weapon with high accuracy, not because he's just better at it somehow. The only thing they bring that's different is their Overdrives, otherwise you can max out every character with everything on the sphere grid and everyone will hit exactly the same max damage... yes that includes Yuna hitting enemies with her stick.
I love that GIF so much, so much cool shit happening all at once.
Oh yeah, I mean I'm aware that in X everyone ends up pretty much the same if you're a hardcore Final Fantasy player (which to be real most of the people on this forum probably are) but I was more referring to the majority of the game where characters are for the most part restricted to their own parts of the grid. The characters, at this stage, all bring separate strengths which don't, in my personal and admittedly flawed experience, invalidate each other. Noctis is special because he's a weapon master, but I don't think that means the characters who specialize are useless as a result.
(Yes that GIF rules Cor is a BAMF and I'd kill to know what Ignis was doing with his weapon there. It's all glowy!)
I find the whole debate slightly pointless. Noctis doesn't have some inherent power level that makes him stronger than the rest. He's more powerful exactly because he's the only playable character. AI contolled characters can't be very strong because then the game would just play itself with regardless of the player's input. If they went with the original vision of having all of them playable, the game would have been balanced accordingly to make everyone useful.
I'm forced to agree with Leon here, haha, Noctis does have a power beyond that of his companions and we haven't even seen him with his heirloom ring yet. I agree with you on pretty much all the rest of this, though; there's a similar conceit in the VII compilation, after all. Cloud being a mako-produced superweapon with the cells of an alien god is a cut above all of his friends in sheer power. You can really see this in Advent Children, and in the sheer power of Angeal, Genesis and Sephiroth in Crisis Core. His party still manages to be integral to everything, and I don't really see why XV couldn't do something similar. Especially given what we know of Kingsglaive and the ability of Lucian royalty to pump up their most devoted warriors.
I also happen to think the party is pretty darn useful already, though I could be talking out of my ass here. The full game hasn't released so obviously any reference to statistics from shown material might not be representative, BUT. The damage numbers on their special abilities seem really massive, and at least two of the members (Prompto and Ignis) have been shown to be capable of inflicting status effects, Prompto's being a bit more useful than Ignis'. I dunno man. They seem really worthwhile to me, and all three of them are very cool cats. I'd love to be able to play as them.