I quite enjoy the Shuriken.
Phalanx: I use it for lightweight incin-ammo spreading on my otherwise Falcon knockback monster sol whenever she's out of ammo, with no decrease in recharge speed - decent clip, fires relatively fast - sure, damage is lacking but what do you expect with such a light handgun? Assuming you've got a primary damage dealer, it's not the worst filler you could take.
Krysae Sniper Rifle? Love it - because it's a SR version of the Falcon - AoE Knockback & Effect Spread on a detonation spammer? Yes please - but I wouldn't take it unless the character I was choosing made better use of SR vs AR.
Honestly - Some people put too much emphasis on raw damage. I enjoyed the Reegar up until I realized it was pretty much the most over-used gun in the game which put me right off. That isn't to say I love running around equipping sub-par intentionally, just certain things wreck my game enjoyment. I'd like to think being a good player means being sufficient at the game no matter what type of weapons you're holding, as opposed to succeeding only because you equip merely the best, or most damaging.
I want to like the Revenant, I really do... But that abomination, even when going full auto into the mouth of an enemy to bypass it's obscene spray, just doesn't seem to help much.
Ultimately I don't care as much about damage so long as I can perform 'something' with the weapon. If it's a case of mediocre damage at no major weight cost to spam abilities, or at least spread ammo effects for constant detonations, I'm happy enough in most cases. Back when I was spamming my SalEngy with Shuriken X / Predator X in my "Still unlocking decent weapons" phase, I still outperformed some people rocking much more popular stuff - but I didn't stick around too long to keep testing it consistently.
They may not be the best, but they're functional at least if you can put damage on the shelf for a second. In fact, half tempted to grab a character and just roll with Pred/Shuriken and see if I don't get kicked, enough to give it another few tests 