I received my MPA from APUS and have gone on for professional learning via undergraduate certificates with them. For the MPA, all of the courses were solid courses with a good level of instructor interaction except for the final capstone! I feel like they have since offered more research support and strengthened that course, so I will give them some redemption for that. Since then, I've undertaken some undergraduate learning and the school has implemented some student service upgrades, such as sending out texts and phone calls to connect students to their learning tracks. The school offers some extracurricular engagement opportunities and online career fairs.
The college offers great tuition for its courses, and undergraduate students do not need to purchase books as the university uses e-books and digital academic libraries for course reading materials. It's always a game with which instructor one will get for a course. Some instructors really know how to engage students in an online platform and offer a well-rounded learning environment while other through reading and written assignments at the students with nothing more than canned responses and a few comments on the written assignments. Even in the latter situation, an independent student interested in learning will gain something useful from the programs, and for that reason, APUS is a very decent, worthy educational institution.
Remember, most post-secondary institutions are reputable on very arbitrary standards--graduation rates (great if they are only accepting high-level high school grads); accreditation (APUS/AMU is regionally accredited); sports and other activities (this college is for veterans and adults, so it's not comparable to a higher learning institution geared to recent high school grads); and entrance requirements. APUS/AMU is a decent school. Students who want to learn will.