Google Analytics

Creating funnels.

Custom event or element tracking

Adding custom dimensions and then waiting for 24 hours for data to populate

Some segmenting

Honing in on specific user behavior

Analyzing traffic along two dimensions (and possibly filtering on either or both) is fairly cumbersome and requires too many clicks. For instance, looking at traffic by landing page type (a content grouping) and then narrowing down into traffic that came via SEO requires a bunch of repetitive steps (vs there being a shortcut dropdown for traffic source type as there is now for content grouping... )

Getting access to reports is sometimes difficult

none. Some users complain about not understanding how different dimensions work with different metrics, but that is something that can be learned easily.

customizations

Finding the right screen with the right data.

You have to read all the documentation and watch the tutorial videos several times to understand all the data.

Setting up the tracking code the first time.