I think time plays a roll in this too. Therefore, for me to just sit down and start playing around with a computer program is very unlikely. I believe Access, Excel and Word contain more functionality than most MBA will use. By the time you've learned everything there is to know, more has been added. However, this functionality is a mile wide and an inch deep.
Access is a functional database with average interface capabilities.
It limits filesize, control and speed. Actually, it works best when built into a windows application. This limits its functions and makes it more controllable. Its scalable up to a point, beyond this SQL server is the way to go. Knowing the ins and outs of Access seems to take the back burner when Microsoft Office is discussed.