- I hate that 3.x forces player characters to wear a Christmas Tree in magical items!
- You know, I really would like an alternate magic system. I hate Vancian magic.
- How do I stop my players from resting all the time just to get their spells back.
- Just stack up on a few Wands of Cure Light Wounds, and your group never needs to go back into combat without healing!
- The Bard sucks. Sure, he can buff, but if you took a real mage instea,d he could buff and blast!
- Fighters are boring. Good for new players, because you have less options, but they are totally overshadowed by the options of a spellcasters. And way too often, by their raw power, too.
- Rogues in undead-heavy campaigns suck. No Sneak Attack, and all you're there is for disabling some traps.
- Fighters can't do anything but fight. Outside of combat, they are useless baggage.
- You never have enough skill points.
- Who ever takes Use Rope?
- I hate it that my players are already creating their "character build" from level 1, just to quailify for all the neat Prestige Classes or strange feat combinations they want.
- Prestige Classes only add to the power creep.
- Making skills important in an adventure is only possible if you know the player characters in advance, because you have no way of predicting what skills they have or at what modifier.
- I really like Iron Heroes. Removes the christmas tree and you have more skills. Unfortunately, the magic system sucks and the overall balance isn't well-tuned enough.
- Racial Classes and Racial Substitution Levels are cool.
- Oh look, there goes another Elf variant.
- Scry Buff Teleport. Best tactic against any BBEG. Or against the players.
- Some spells break the game. You can't run a "normal" murder mistery beyond level 5 or so. You always need to use contrived reason why divinations and similar spells don't work.
- All those Save and Die spells combined with Raise Dead & co just create a revolving Death Door. Death loses all meaning.
- How do you really kill someone forever in D&D? How is a political murder to work without heavy use of magic?