Depends what you regard as SQL Server.

1. The relational engine

2. The column store engine

3. SS IS/AS/RS

4. Full-text search

For me full-text search is disappointing. That is why people suck data out into Apache SOLR.

Having used Ab Initio I can say that SSIS isn't brilliant.

The question I have is whether you think SS IS/RS should be open-sourced?

For what you get the costs aren't as bad as they are made out to be. Open source is great on the community editions but you quickly reach the point where what you actually need is the Enterprise Edition in which case the costs are comparable and you have to factor in the additional effort to integrate everything.