Okay here's some criticism.
1)Dirt, Drowning, and (I think) Gravel Creepers should be disabled, because all they really do is leave a giant mess behind for you to clean up. Compounding that is my second complaint:
2)What is making creepers explode even if you get out of line of sight or back away!? This is incredibly annoying and gradually destroys the world for no reason. It also seems as though every creeper type scatters fire everywhere, not just Fire creepers. Disable that too! Uncontrollable mobgriefing is one of the worst possible things you can put in any modpack.
3)Hungry and Thief types of Specialmobs should be disabled since they tend to break things. Hungry spiders will just steal your entire inventory for no reason, and Thief mobs can similarly steal stuff from you. When these mob types die, they do drop everything(I think?), BUT then that stuff is vulnerable to fire or explosions, which due to problem 2 are commonplace.
4)Geists are just annoying, they should probably be disabled. Shadowflame doesn't even seem like it's fully implemented. It "pops" when you hit it, and has a block-shaped hitbox unlike fire.
5)Zombies should not pop out of your gravestone when you mine it. That's just a bad idea. Either you're right on top of the gravestone when it happens and thus die almost immediately, or you're at a distance which leaves your items to the mercy of the elements if you die again.
Lastly, spells that are touch-only should be described as such in the quests that give you those spells. I thought I had to get an Arcane Compendium before I could cast anything, because all the spells I had were touch-only and I was trying to cast them at a distance!