If the Javelin had the Kishock's Shield Gate ignoring, I would use it. As it stands right now, the Widows penetrate enough anyway, and the Kishock does more damage (even without the Shield Gate thing), I find it very hard to justify using the Javelin.
And as to the Carnifex/Paladin, I hate the Paladin, the Carnifex outperforms it, and is more versatile. Arc Pistol is one of those guns that I WANT to like, I really do, and on paper, I do like it. Same with the Acolyte. I just don't really like the charge guns in this game.
Just give me a Saber, a Lancer, or a Claymoar, and I'm pretty happy.
Numbers and facts say things about a weapon, but it's hard to take them all into consideration and even so, you have to think about this as a whole instead of an accumulation of several factors. The objective part (facts) and the subjective one (opinion, enjoyment of the weapon, personal skillset, experience etc.) both work together as a whole. If you don't see that, it's hard to see past your own estimations and you'll have trouble understanding why others feel differently about the same thing.
I remember not so long ago, I was talking about how FHE+Carnifex was my all time favourite combination. Then somebody said it was good but Asari+Carnifex was better. Then I must have said something about my undying love for FHE+Carnifex and he answered me, basically saying that I was wrong and that fact A + B + C = Asari+Carnifex was better. Genuinely missing the fact that I wasn't talking about what's better or more efficient but just about my favourite combo which are two different things. My favourite combo was determined by some objective factors sure, but a huge part comes from subjective ones. Found memories I have from my beginning of ME3MP or even random things like the sound of that gun. As another example, I could say that the fact that the Claymore is associated with Krogans and Grunt makes it way more baddass in my eyes and somehow adds to its value.
What I can say about Javelin vs Kishock, is that from my own personal experience and what I've seen from other players for years, on Platinum with specific kits (like GI or Salarian inf for instance), Javelin will be more efficient. Doesn't mean it's better, merely that in a clear significant way, I've overall gotten better scores with it and seen better scores from other players. I can't explain why nor do I really feel the need to. You may have a different experience of the weapon and if Kishock works better for you then great, whatever floats your boat.
I'm not saying that I'm not willing to listen to other player's suggestions and try new things. I've done that a lot since I discovered BSN, it's fun and it made me change/improve a lot of things in my gameplay. On the other hand, if I'm way better with a weapon than with another, if I enjoy using it more and someone tells me my weapon is crap and that the other is better because A and B and C... Well, like I said, I'm willing to try new things to a certain point but some things just work better for you wheter you can make sense of it or not.
Same with the Carnifex, you said it outperforms the Paladin, I can't agree with that. They way I see it, they both work better or worse depending on the myriad of factors you associate them with. From the way I play, my skillset, preferences and considering many external patterns as a whole, I can say that I've been more efficient with the Paladin. Meaning getting higher scores overall. One reason is that the Carnifex lacks a bit of damage on Platinum which is the difficulty I play the most. That reality might not be true for everybody, like I said, many factors to consider. Despite that, I still like the Carnifex more. Not because of efficiency, I just have better fun with it overall but that's absolutely not because of statistics only.
Players will be arguing about weapons until the end of time. Like people worship the Claymore and others hate it. How people feel about those things is fine, but the ones trying to shove their own opinions onto other with brute force is pointless (not talking about you). Like we had that war between Valiant and BW recently if I recall correctly. And then players willing to thunderdome to prove the truthness of their opinions which is impossible as they are opinions.
I don't like the Jugg, doesn't mean I'll dismiss other player's appreciation of it. I've seen some really good gameplay both in efficiency and teamwork from some Juggs. I've accepted that I don't like playing it, probably the only reason being I can't stand the lack of mobility and that it doesn't bother others as much as it does me.
Yeah, I've gotten a little out of topic here but I've been active on BSN for a few moths and I can't count the times I've seen people arguing about a weapon or a kit being better, a faction being worse , the best way to spec a kit etc. It's really fine when people are talking, exchanging, but sometimes it looks more like a fight ! So yeah to sum it up I think a lot of players take their opinions, however elaborate they are, as objective truths and can't accept others when they differ greatly from their own which is a shame.