I have some gripes with 3.5 and thought I'd make a little checklist of problems I'm looking to be solved in 4th ed.
-To have a certain skill set, you have to be a certain alignment. For instance, to be good at bluffing, sneaking, hiding,etc you have to be a bard or rogue neither of which allows for a lawfull alignment. Law enforcement and politicians can be just as good at lying as thieves.
Basically I want to see alignments removed or a change to the system that determines characters skills. Perhaps players can choose a certain number of skills plus their intelligence modifier. In the past, this current system has caused me to roll up a character and then determine who they are. Players should be able to determine from the beginning what type of character they are and then the game should be able to accommodate that.
-Skill points at each level are a set number while hit points for each level involve rolling dice. Make it a set number plus constitution modifier for each level so that we can remove the unnecessary dice rolling. This should also allow matching up monsters with the group more accurate.
-Anybody else think saving throws are stupid and another unnecessary stat? Those saves could just be made by rolling with the root stat's modifier.
-I wish the spellcasters were a little less vulnerable at lower levels.
-It would be nice if leveling was more of a steady increase. I've actually heard they've fixed this but only heard it in reference to spellcasters. With other classes though, there's still uneven leveling. For instance 5,7,11,13,17 and 19 are lame compared to other levels while level 12 is amazing with base attack and saves increasing as well as getting two feats and an attribute point. I'd like to be able to be excited about each level.