Because I am in good mood today, I am going to give you a
full list, from the easiest to the hardest monster (in my opinion, of course). Here goes:
1. Barracuda Shark. They can't even get near you, let damage you. They're just a waste of ammo.
2. Blaster/Light Soldier. They are easy to kill, don't have good aim, and are Bantha fodder for Machine Gun and Shotgun Guards (I love it when I make enemies fight each other and determine who would win).
3. Brains. He's so slow and can't even think of damaging you. It's just his shield and his high HP that may extinguish your ammo pretty quick.
4. Berserker. Claims to be an expert on melee, but Mutant is way better. He actually helps me get to higher secrets.
5. Iron Maiden. They're slow and are easily defeated, don't have lots of HP.
6. Enforcer. They're easy and slow. Machine Gun guards are deadlier, and aim better, and are faster, but have less HP.
7. Tank or Tank Commander. They're too easy and too slow - just a waste of ammo. Machine Gun soldiers are much stronger and aim better. A Machine Gun soldier with the amount of health of a Tank would be a formidable opponent.
8. Flying Boss. KOTS2000 calls it Prince of the Air, I don't know what his name actually is. He's very easy, just keep strafing and you'll be fine.
9. Jorg. This is the machine Makron sits on. It's pretty easy, just keep strafing and hide behind pillars when he unleashes BFG10K.
10. Medic. The medic himself isn't at all strong, and is easily slain. It's just his healing abilities that are a nuisance. Don't think you'll be happy when you find out Medics have resurrected a Tank Commander, or Makron. Yes, I have played custom Single Player levels, in which Makron can be resurrected, and it'll be most likely, because Medics spawn near him after you kill him and you'll have to fight him again. That's in Premonition of Angron.
11. Land Boss. These big tanks, Tank Leaders, I don't know what they're called. They're easy if you keep strafing, it's just that their unexpected rocket attack might hit you, but highly unlikely.
12. Gladiator. He might seem easy if he's alone, but a stationary Gladiator is much deadlier than a walking Gladiator because he aims better and you have to get near him to get him to use his melee attack. Also Gladiators that come in large pockets may be too much, because while concentrating on one, the Rail Gun on the other has a high chance of getting you.
13. Makron. He's easy if you keep strafing, you can dodge his Rail Gun and Hyper Blaster that way. But he fires his BFG10K fast, unlike Jorg, so be prepared to hide behind an object.
14. Machine Gun Soldier. Even though they can damage your HP and lower it quickly, they are easily defeated. But, they're frequently in large numbers and will cause you trouble.
15. Gunner. Let's not forget them. They are actually deadlier when they are alone, or with more Gunners. Their grenades are deadly and if one of them gets you, there's a chance the others might, too. But Gunners, luckily, are best at damaging
themselves, or other Strogg in the area and that'll keep them occupied fighting with some other Strogg while you fight others.
16. Shotgun Soldier. Impossible to dodge by strafing, and they are often in large numbers, or with Machine Gun Soldiers, and they become deadly.
17. Technicians. Icarus and Technicians are pretty much the same, but Technicians can be fooled to use their melee attack, unlike Icarus, which makes them less of a threat than Icarus. Also, Icarus aim better, and Flyers aim better than Technicians, too.
18. Flyers. They are like Icarus, but with less health points.
19. Icarus. They have nice auto-aim hack and are hard to dodge.
20. Parasite. You cannot dodge it, it's fast and when I am doing runs on missions that I don't want to lose any HP or armor on, I am usually reloading around the time Parasites are there. And, they're quick!
21. Mutant. Just being around him causes me fear. Not to mention that his Jump attack does incredible damage, and you can't get close enough to prevent it because he'll melee attack you instead!
So here it is, I hope you have read it thoroughly!