Is it worse? Yes. Is it still good? Yes

I played all night last night on level 8s and a few 9s (specifically to see if I could clear with the eruptor) only using the eruptor and won every single mission, with kill counts comparable to my allies.

I still one shot most things, can get 3-4 kills if they're really grouped up pretty reliably, and killing bug holes and fabbies is crazy levels of utility that we can't ignore.

There's a lot of hyperbolic posts on this subreddit every time something gets nerfed and I think there's a good chance the devs just completely write it off, because it isn't true. People screaming that the eruptor is useless are quite simply wrong, you can totally clear missions with it without any significant effort, and I had fun the whole night.