In online classes, you don't experience the academic and social benefits of involvement in campus life. For example, when you take your classes online, you may not always be aware of certain student organizations that can help you in your future career and assist you in establishing new friendships. This is why you should visit the campus occasionally to inquire about upcoming campus events or clubs you can join based on your interests.
When you're completing most of your assignments online, it becomes tempting to take shortcuts with your work. If you're assigned to write a ten-page research paper on the roots of World War I but you don't feel like going to the library to gather research, you may decide to borrow heavily from online scholarly articles and rephrase the wording to make it look like your own. This affects your academic integrity in negative ways.
Online learning can hinder your ability to have a hands-on educational experience because you often deal with isolation when learning online. For example, if you were attending classes on campus, your professor could have you do group activities outside of the classroom to reinforce what you learned. With online learning, you're getting your lessons in an impersonal way.