Well one area I feel 4e is more limited in, than 3.5 is, would be customization of a character (outside of combat). In 3.5 there are many feats, such as Negotiator, Investigator, Persuasive, etc. that allowed you to customize a character on a finer scale than in 4e. These feats in 3.5 were like personality traits that actually mattered in the game, and could be used to represent inborn talents that a character had...outside of skill focus. In 4e there are a few, but it's breadth is much smaller, and deals almost exclusively with physical skills. Now the only problem 3.5 might have had in this respect was the number of feats one had to spend, but you still had the option of being slightly less effective in combat but more adept at something outside of combat. The thing is, IMO, 4e gives you more feats but less breadth to distribute them in creating the character you want.