I am going to make a top ten enemies in Fallout 3, just because I want to . And I have compiled a list, but I want some people here to put them in order from; 1. Strongest to 10. weakest.

Deathclaw
Experimental Weapons Drone (Mothership Zeta)
Sentry Bot
Ghoul Reaver
Mirelurk King
Super Mutant Overlord
Super Mutant Behemoth
Albino Radscorpion
Enclave Soldiers
Swampfolk

I see it as;

• Super Mutant Behemoth
  
• Deathclaw
  
• Super Mutant Overlord
  
• Ghoul Reaver
  
• Sentry Bot
  
• Albino Radscorpion
  
• Enclave Hellfire Soldiers
  
• Swampfolk
  
• Mirelurk King
  
• Experimental Weapons Drone (Mothership Zeta)

I would say that, especially for a later level character, Hellfire soldiers are quite easy, possibly a 10. And swampfolk are a 5.