A colleague claims BizTalk is slow and should not be used. He argues that he has never heard anything positive about BizTalk, that it is slow and that customers using it wants to replace it with something else.
I'm in the planning phase of some datamigration and I wonder if more people feel this way. I find it a bit hard to believe that it should not work properly.
I'm looking into using BizTalk for nightly updating a few million records in Dynamics CRM instead of writing a custom app.