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Sorry for that, but for God's sake... I...I lost my train of thought. Oh yeah, they can kill individual specimens at around the same rate, but please, show me a Commando that can get rid of 60 6 man HoE gorefasts in 10 seconds without A) dying, or B) the use of grenades. Also, don't come at me with that wasting ammo bull, the Firebug's weapons are so darn cheap that you can stockpile them like there's no tomorrow. In fact, I think the only TRUE advantage Commandos have is the ability to headshot, and you know what, that may be enough, seeing as you can spray a Scar mag and a few bullets from the AK to a scrake's face to bring him down. (Also take note that Support can do that better.)
Well, if I was trying to prove you to be an idiot, this post would have been all I needed to do so.
1. The cost of ammo is not the issue, it's the consumption during the round. The Firebug can kill stuff, but he is just wasting ammo doing it, especially on Sui and HoE. If you are focusing on just killing specimens as a Firebug, you are doing it wrong.
2. You can't stockpile ammo, you can only carry a limited amount.
3. You won't take down 60 6-man HoE Gorefasts as a lone Firebug without burning through more than half, if not all your flamethrower ammo. I also doubt you would be successful, even if fully stocked. I challenge you to prove me wrong with a video.
4. Commando and Support shouldn't be taking out Scrakes or Fleshpounds. Sharpshooters or Berserkers should be the ones dealing with the Scrake's and Fleshpounds, and to a lesser extent, Demoman for Fleshpounds. If your team is in a bad enough situation, then everyone else should gang up on these specimen. Unless it's a 6-man Support team, Support's role is taking out the smaller specimen, like the Commando.
5. The Commando has a much higher ammo capacity than the Firebug, has an overall higher DPS and total damage potential, has a MUCH faster reload, can see Specimen health, can see cloaked Specimen, and has grenades that actually cause explosive damage. Commando > Firebug.
6. Do you actually play HoE?