Bump for Love
The Fatman is much, much weaker than it was in Fallout 3.
I noticed this too. Maybe it's because I have such low explosives skill, but I shot a mininuke at a group of legionnaires and they survived with at least half health. Even the one that the nuke landed right next to. I then dropped the fatman on the ground and never bothered with one again.
it only does a measly 90 DAM and its DPS is around 150