Graal, Kishock and Phalanx (I haven't played with Javelin much) should be A-Tier, and maybe Mattock too. I don't have much love for Disciple, but at least is light for secondary weapon in same classes.
Mantis B-Tier at least. Good damage for its weight.
Black Widow is definitely S-Tier; in the top5 (Krysae, GPS and Claymore are in other different tier IMO). I think people have seen a bad infiltrator with BW I (or themselves) and have this odd idea is worse than Valiant... it is not. I don't like playing sniper-infiltrator much, but when I do is with my BW VI, and it just kills everything in sight. Armor? I wouldn't like having a Valiant instead of a BW for that... and in Gold they are Legion

Tangster wrote...
There should be fewer tiers.
-Easymode(ex, Krysae, GPS)
-Gold Viable(ex, Claymore, Black Widow, Talon)
-Not Easily Gold Viable(ex, GPR, Vindicator, Phaeston, Viper, Scimitar)
-Crap(ex, Locust)
-Eagle (ex. Eagle, Shuriken)