Hi,
This post is just a question and not any kind of request (before the wild “Go back to D3” players appear)! 
Has anyone tried the fire elemental druid and killed Baal in hell? Mine is at lvl81 right now, has about +14 elemental skills. I put 1 pts on summons and they also has some +skills on them. I am using the Act 3 merc with many +skills on him to boost Static, and it is brutal how easy is to kill 99.99% of the mobs, even if they are fire immune (compared to pre 2.4), but Baal takes ages to kill.
I dont have any GG -fire res gear, but for P1 I should not need it anyways and once again all other mobs goes down pretty easily. IIRC Baal has 50 Fire resistance and 0 Physical resistance at Hell, so Armageddon and MBoulder should destroy him easily, but this is not the case, so I am wondering if this is just a bug? I will do a boss kill run today to see how easy is to kill the others at this level, but I do not remember that any other mob needed more than a few seconds to die (except maybe Diablo, but he also was not hard to kill) even when I was just leveling from lvl63 (when I started Hell).
That’s pretty normal. Summons have reduced damage against bosses and take more. And skills that kill lots of mobs don’t hit the single targets so hard. For bosses you need to find some crushing blow or cresent moon runeword on your minion to drop their bulk health a bit faster
My warcry barb blitzes Baal waves like they were made of glass, but Baal is solid steel. I’ve got an immortal kings maul as my secondary with a point in whirlwind to get that crushing blow into the boss.
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I only use the summons for meat shield. My druid is fire elementalist and I use Act 3 merc. I know about CB, the post is not about “how to kill Baal”, but “why does it take that much longer than any other mobs”. 
Yesterday I got a dudu torch and now I am lvl82, so even stronger than before. I tried a few mobs, including Diablo, The Countess, Eldritch and Shenk, several elites/champions, and when going for Diablo even one of the seal bosses was fire/phys immune. All of them went down pretty quickly. I even tried not casting any spells to see if my summons can do any noticable damage to this last elite, but it was extremely slow, so I know that the damage output comes from Armageddon, Volcano and MBoulder.
Diablo has higher resistances on Hell than Baal (fire 50%, phys 45%), though his health is only ~1/4. Still, it was not that noticably slow to kill him, whereas Baal takes like 6-8 minutes or so. Even Lister and his friends died within 30-40 seconds or less. It is only Baal that takes incredibly long to kill and I always make sure to position myself below his position on the screen as Armageddon hits mainly in the area above the druid.