You can't complain about what it does well and what it is not effective in supporting because it's essentially a free product. When compared to the astronomically high cost and convoluted Adobe Site Catalyst/Omniture software, Google's UI and intuitive menu labels is best in class for slicing/dicing web analytics data to find just about anything a client may be interested in... quickly and efficiently.
Some data visualization options for viewing/interpreting rows of data could use improvement. It's not exactly plug and play for presentation ready decks that make sense to a layman client. It's easier to export a .csv file and crunch the data set yourself to create a customized chart that's more client centric.