One major area where Tableau fell short for us is authentication. We would like LDAP (or Windows AD) SSO authentication to the server based Tableau product. We also want Tableau to handle authentication methods back to data sources like SQL Server or SAP BW other than a hardcoded ID/password. At this point I think the product falls a little short. Our workaround is dumping data to text files and then integrate in Tableau at that level. That extra step prevents us from looking at Tableau as an enterprise reporting/analytical tool. We have passed this info to Tableau support and are waiting to see how the product develops going forward.