I think the main complaint is that the percentage of the kits dedicated to specialty parts limits their usefulness for free-form play. Sets of the 80's had fewer block types, which forced Lego to be more creative in how the sets were put together, which subsequently allowed more freedom in using the blocks for other designs. The sets my kids are playing with look much more "realistic" to what the set is trying to model, but very difficult to build something entirely different, such as building a house from a car kit.