I just saw a question migrated from MSO and it immediately made me think about my confusion long time ago. The reason was, of course, the fact that the number of views doesn't get migrated and always resets to 1 after migration.
For example, the question I just mentioned now has 218 upvoted and 21 views. This huge number of upvotes this question received while being on MSO. Fine. But the views didn't get migrated - it had 1127 views. Those current 21 views is since the question was migrated, which is not right. I propose to migrate the number of views.
There is another problem. Favorites aren't migrated also. But I don't think it should be "fixed" because actually not every user who favorite's question before the migration has an account on the target site.