What’s with all the Decay weapons?

Personally I don’t like them. I know of a lot of people that do, but the firing rate/sequence is inconvenient for the way I play.

They just haven't updated the leaderboards for a while. They radiation weapons are still good, especially for countering the laser weapons, because you can reach them easier. I like them, but don't run them anymore because there are better options.

I've got a MK2 rad gun setup on my Fenrir that I like because it's good at slapping flying bots in the endgame, and I can also deliver good hits on Titans (slower and bigger, so it's easier to get the repeat hits that stack the damage).

On my Pursuer, I've got three of the light versions at 1.9 or 1.10, and they're definitely less useful, but I'm also running Otto as the pilot so at least there's more volume of fire. They've taken the place of Magnums on that bot for me; I could probably also run Magnetars, but Otto doesn't support those.

I run rads on my Fenrir and Tyr, my two core robots, love them. Yeah it can be hard to hit the tiny boxes, and reload means soaking up damage on occasion, but taking out a Seraph with rads is, well, rad.