Entity Framework 4 missing features?

I'm well aware that similair topics have been brought up before e.g. Entity Framework 4 vs NHibernate

But instead of arguments like:

• NHibernate have been around longer and is more mature
• EF4 is drag n drop and not enterprisy开发者_如何学Go
• EF4 and LinqToSql are ...

I would like to see a more detailed list of features that you consider missing from EF4.

Personally, I think the lack of enum support is the biggest drawback of EF4.

Ayende did a good work of listing NHibernate advantages over EF here: http://ayende.com/blog/archive/2010/01/05/nhibernate-vs.-entity-framework-4.0.aspx

In a nutshell, NHibernate contains many more ways to improve performance in real world scenarios than EF4 (batching being the most obvious), and more flexibility and extensibility pretty much everywhere.