As a college instructor, I like to provide feedback for my students' writings. At the grad level, students are required to use APA style formatting, so I like being able to track corrections and suggestions in a student's paper and the ability to insert comments as one is able to do in Microsoft Word. I have attempted to use Quickoffice and iAnnotate apps. They are really not satisfactory for my efforts. If any can suggest apps, which might fill this gap, it would be appreciated.

Try cloudone. It has more of the features found in Microsoft programs. You will need Dropbox or another file saving program to use with it.

It’s awesome to see how you’re having students create work on the iPad!
For teachers who are looking for a super easy to use service to facilitate assignment or project file workflow between themselves and students, we’ve created a service called Showbie. With Showbie, teachers setup a class and assignments. They invite students to the class by giving the students a class code that links the student with all the assignments in the class once the student joins Showbie. This gives students each and assignment drop folder where they can upload work from their laptop via our website, or through WebDav. If you’re a teacher or student and on the iPad in an app like Pages or Keynote, you can easily save work into your Showbie assignment folder by putting in the Showbie server URL ----- Rule 13

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and then entering your Showbie login and password. Going forward, you won’t need to put in these credentials unless you log out of the webdav connection.
If you have any questions or want to check us out head over to showbie.com!
Thanks,
Colin
Learning Happens Everywhere

Showbie - except that doesn't answer the ops question. Seems more a business plug.

To the OP, office2 hd now supports tracked changes... I use docstogo and like it but do miss that feature...

Originally Posted by txdkmw

As a college instructor, I like to provide feedback for my students' writings. At the grad level, students are required to use APA style formatting, so I like being able to track corrections and suggestions in a student's paper and the ability to insert comments as one is able to do in Microsoft Word. I have attempted to use Quickoffice and iAnnotate apps. They are really not satisfactory for my efforts. If any can suggest apps, which might fill this gap, it would be appreciated.

You can try CloudOn or Onlive Desktop. Either of these use Microsoft office 2010.