It used to be bad enough dodging constant Ghast fireballs, but now I am finding that my life expectancy (with iron armor) is under a minute due to the combination of firebats and heatscar spiders, both of which set you on fire. Being on fire in the nether is a real bummer because there's no way to put yourself out. So even if you defeat the enemy, you will still likely burn to death. Is the nether supposed to be like this now? Like a realm where you need something on the order of invulnerability just to enter it? The Nitro Creepers are also abound, which will insta-kill you unless you are heavily armored. There's not even a chance to kill them with a sword first. On top of all this, I have Mo Creatures installed which has its own assortment of hostile nether mobs.