How many people are frustrated by just doing a sum or match count–or don’t even try? How about auto-resizing of fields? Or viewing two tables side-by-side? Or adding comments without filling a cell. Or creating simple charts? These should be easy on spreadsheets.
Things that seem tricky like using a relational database on the backend or versioning data aren’t really tricky, and they’re not complex concepts.
This is 2011! You should be able to have multiple tables side by side, with descriptive bubbles and dynamically updated data, automatic formula calculation from templates, and form data-entry workflow without even thinking about it.